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Computer viruses are now a daily occurrence, making it a part of our daily lives like waking up and taking a bath. Everyday, thousands of computer viruses and worms are spread via email and other modes of transit.

As a matter of fact, computer viruses are some of the most common causes of hard drive error messages and other related problems such as the slowing down of a computers memory and applications. An anti-virus software or a virus repair is now a must part of a computer system.

An urgent computer virus repair is definitely required when inflicted with a virus because the damage they cause can be quite disturbing, crippling your operating system and programs to the point where you cannot use your computer at all when not acted upon immediately. Abrupt attention is necessary if you want to recover your files and documents.

Some viruses search your computer and send email that has a virus to every email address found. Thus spreading themselves all over the internet, making their growth reach high proportions.

Some viruses send out attachments, files and documents that are taken from your computer, which critically compromise the security or privacy of your information, private files, and personal communications.

So it is very important that a computer virus repair should be done immediately.

But first in order to discover virus you should follow this step:

Scan your computer with an updated antivirus program. But if you do not have an antivirus program installed in your computer, there is free online software that you can use. An example to that is the Trend Micro, Inc., which offers a free online virus scanning service. Just click on the following site:

http://housecall.trendmicro.com/housecall/start_corp.as

And then

Install the latest security patches from the following Microsoft Web site: http://windowsupdate.microsoft.com

Here are two main reasons when you should get a computer virus repair:

Contracting as a Computer Aided Design engineer in the UK can be very lucrative. There are many ways in which you can maximise the income you receive.

Many contractors choose to find work through agencies. Agencies generally charge a finders fee (to the client) and also take a cut of the rate paid to the contractor. This is often 10-20% of the contractors rate. Agencies do provide some services for this cost, however many contractors find that they do not require these services. If the contract lasts for several years, the cost to the contractor can be many thousands of pounds. Because of this, it can be advisable to approach companies personally and avoid the use of agencies.

Employment and tax laws in the UK are not very friendly towards CAD contractors. There are different mechanisms available to maximise your income. There are (generally) three methods of working as a CAD contractor in the UK; as a Pay As You Earn (PAYE) contractor, as a an employee of an ‘umbrella’ company, or as a Director of a UK limited company.

Working as PAYE you will generally earn the least of the three, as you pay tax and national insurance as if you were an employee of your client. This is expensive, as some of your income is liable to be chargeable at ‘supertax’ rates.

Working as an employee of an umbrella company has advantages and costs. Contractors usually pay a monthly fee to be a member of an umbrella company, this fee can often be more expensive than the fees an accountant would charge for a limited company. Also, umbrella companies do not offer flat rate VAT schemes, which means that a contractors earnings will be around 6% less. Umbrella companies are usually less flexible than limited companies with regard to expenses claims for items such as equipment, services such as training and overheads like travel and subsistence. The advantages come through the hassle free way that umbrella companies work. They generally require no more than a timesheet to be submitted weekly, and work out and pay all your tax and national insurance contributions before depositing the remainder into your bank account. Umbrella companies also spread the cost of expenses such as professional indemnity insurance and (tax) investigation insurance.

The one real advantage of having your own limited company comes through the flat-rate VAT scheme. Most contractors will only have to pass the Inland Revenue 11% of the 17.5% VAT collected from their clients. The effective result is a 6.5% pay rise!

http://CAD.cc has news and articles on CAD contracting for both Automotive and Aerospace industries in the UK.

It’s happened to so many of us at one time or another in our technologically obsessed lives. We process important information in the computer. We’ve been so engrossed for hours, that we pretty much lose track of everything else. And just when you are almost done, something major happens, and you will regret it for the rest of your life.

An unexpected power outage. The blue screen of death. And you realize as you bang your head on the wall, that you didn’t save. Isn’t that sad.

Okay. So maybe you were careful enough to save every so often just so that you don’t lose your important information. Heck, most programs now have the new-and-improved autosave function, just work away at your desk, and the computer will do the rest, saving your work automatically every few minutes or so.

So your resting easy on your chair that whirls about and gives you a few occasional bouts of headaches and nausea.

So you saved. Is that it? Don’t you know that shortcircuited, faulty wiring will zap all your precious data in a spark? Don’t you know that unscrupulous hackers and prowlers will try anything they can to rip off important information from you? So what do you do?

Well, folks, the key word here is backup, and no, we’re not talking just backup. We’re talking about maximum-security backup. Hey, information is precious. You don’t see those leather-bound encyclopedia volumes coming cheap now do you.

Your information could be worth millions of dollars. Or even if it’s just your very own personal information, and even if nobody wanted it anyways, it’s still priceless to you, and that’s what matters. It is always a monumental loss if you lose something to the ill incidents of technology.

So what do you do to protect your important, precious files? Backup, and how! Backup several different copies in different places. Print it out, burn it on a compact disc, store it on several different hard drives, flash drives, your ipod, wherever.

You can never have too many backup copies of your mom’s famously delicious top secret chocolate chip cookie recipe. Of course, keep in mind that as you update your original files, you should update your backup files as well, not forgetting the backup media used also.

I mean, you may have stored tons of backup copies on tape magnet, but I think it’s safe to say that we’re well out of the era of low-tech storage media. It’s time to update your backup copies before they get phased out altogether and you will have no way of restoring them.

Of course you actually need to keep your backup safe too. You can’t just leave them exposed to the elements and untrustworthy people. Store the cds and drives as required: keep out of sunlight and high temperatures; as the manual reads. Keep it somewhere where you know you will find it.

Don’t play with it too much. Store in a cool dry place. And if you are the kind who is not messing around with data at all, you may already know the high price at which you value your very important information.

Therefore, take all the necessary precautions. Don’t just take backup, keep it under lock and key! Encrypt like crazy. Toss in several different levels of maximum security.

Update your software regularly. Just keep following these things and you will be successful with your backups and you won’t have problems retrieving your information again.

James Monahan is the owner and Senior Editor of http://www.BackupWebs.com and writes expert articles about backups.

Directories, in computer science parlance, are the listings of files, documents, and other directories within a file system. Most people think of directories as electronic folders that contain various files.

A directory is one of the first concepts anyone learning computers encounters aside from files. He or she soon learns that these files are all contained in a listing called the directory.

Who could forget the early DOS days when the command of choice was “dir c:”?

A directory contained inside another directory is called a subdirectory of that directory. Together, the directories form a hierarchy, or tree structure. Organization of file systems into such makes for a more organized hierarchy.

It allows the files to be grouped according to the owner’s desire, and presents a more organized alternative to just having all the files dumped into one listing.

Microsoft Windows and the Mac OS use folders to represent directories. This helps the user to visualize the directory as a folder that contains many papers and documents. The papers and documents represent files in the system.

With this tree hierarchy Windows and MacOS supports, one cannot just simply access a file from any point. He or she must access the file using a path.

For example, if the user is currently browing folder x, the only files he or she can access are the files listed in that folder. To access files found in folder y, the user must traverse the path from one directory to its subdirectory until he or she finally accesses the folder or directory that contains the file needed.

Historically, and even on some modern embedded devices, the file systems either do not support directories at all or only have a flat directory structure. This means subdirectories are not allowed.

There is only a group of top-level directories that containing files. This is similar to just having one directory for all your files.

The topmost directory in a file system is called the root directory. These directories contain other directories that are fittingly called subdirectories. The subdirectories may also contain subdirectories. This can go on and on indefinitely.

Depending on how an operating system supports directories, filenames in a directory can be viewed and ordered in various ways. They can be viewed and sorted alphabetically, by date, by size, or as icons in a graphical user interface.

The word directory is also used in computing and telephony with a different sense: a central repository of information related to management of a computer or a network of computers.

This includes data on applications, hosts, users, network devices, security credentials and more. This kind of directory, as opposed to a conventional database, is heavily optimized for easy reading.

Everybody who uses computers uses directories. Only, he or she may not notice it, or may not be aware of how this concept works. Most people make the most out of the directory concept by using it to organize their files.

If all their files were just dumped in a root directory, they would waste much time just trying to sort out the files that they need.

The concept of directories is constantly evolving. Even now, software developers and researchers are constantly devising ways to make organizing and sorting their files and directories easier. And as this researching continues, users can only gain from the tools directory management brings.

James Monahan is the owner and Senior Editor of http://www.InfoTyphoon.com and writes expert articles about directories.

For the lay person, the term database is just another geek word that is just so prevalent in today’s society. From the office, to the home, and to just about any industry, people refer to their information as being kept in a ‘database’.

So somehow, we all get this idea that the database is some cabinet that holds all the data for a given organization.

But what is a database, anyway?

A database is any collection of data organized for storage in a computer memory and designed for easy access by authorized users. The data may be in the form of text, numbers, dates, or encoded graphics.

Since databases made their debut 1950s, they have become mightily important in the everyday operations of every major and even minor industry.

Databases make the output of needed data and reports easy, convenient, and almost instantaneous. This is a far cry from the ‘barbaric’ methods once employed by every industry.

Those outdated methods included collating data from paper files whenever a report was needed. That process wasted a lot of time and effort. With the help of databases, these manual methods quickly found their demise.

Small databases were first developed or funded by the U.S. government for agency or professional use. But in the 1960s, databases became commercially available to the public.

However, their use was channeled through a few so-called research centers that collected information inquiries and performed them in batches. Online databases-that is, databases available to anyone who could link up to them by computer-first appeared in the 1970′s.

Computer programs that manage and query a database are known as database management systems (DBMS). Database systems are actively studied in information science.

The overriding concept of databases is the idea of a collection of facts, or pieces of information. Databases may be structured in a number of ways, known as database models.

Database Models
Flat Model

The flat (or table) model consists of a single, two-dimensional array of data elements. All members of a given column are assumed to be similar values, and all members of a row are assumed to be related to one another. For instance, columns for name and password might be used as a part of a system security database.

Each row would have the specific password associated with a specific user. Columns of the table often have a type associated with them, defining them as character data, date or time information, integers, or floating point numbers.

This model is the basis spreadsheet systems such as Lotus 123 or Microsoft Excel. However, these applications are not typically thought of as databases per se.

Network Model

The network model allows multiple datasets to be used together through the use of pointers (or references). Some columns contain pointers to different tables instead of data. Many major industries adopted this model in the past few decades.

Relational Model

The relational model is the most popular of the database models today. This model is the basis for such database systems as Oracle, mySQL, and even Microsoft Access.

In this model, logically related data is kept in tables not unlike the flat model. However, unlike the network model in which tables are connected via pointers, the relational model is interconnected using keys or values within data rows in tables that point to other tables.

The SQL or Structured Query Language is used to manipulate and derive data from such databases.

James Monahan is the owner and Senior Editor of http://www.TopDatabaseSites.com and writes expert articles about databases.

Computers have become a central part of our daily lives since the first personal computer rolled of the assembly line. It has been doing most of our encoding and word processing chores since then on.

Schools, libraries and classrooms have deployed computers to be an aid in teaching children the basics of learning. And it has become one of the most powerful and irreplaceable piece of equipment for home, education, industry, government, commercial, media and even military use and it still does not stop there.

Computers have long surpassed the age when it was just a calculator for big number operations and a typewriter for memos and other short documents. Along with the upgrading of the computers, people also thought of a way that they could make the computers to communicate and share information.

The network was born out of the need to have communication in big companies to lessen the time that was spent by walking over to the person. And the Internet was born out of the need to communicate with all of the people that we know that we have been separated from by mountains, oceans, and even deserts.

With the introduction of the Information Superhighway, people became more dependent on computers. Computers have turned into some sort of a central equipment that is necessary for the society we live in to function.

But what happens when you cruising along the Information highway and you were struck by a worm. No problem right I’m protected by my Anti-Virus program. But what if you’re not?

Early this year Microsoft released a software they call the Removal tool. The removal tool is a post infection removal tool. What that means is, if virus has struck your computer and you have no knowledge of it this removal tool will take care of that.

The Microsoft Windows Malicious Software Removal Tool scans your computer for a prevalent malicious software that has been running around your computer. Because most computers operate normally even after an infection this removal tool will help you save your computer future complications if the malicious software persists.

The removal tool works around the programs in your computer and finds malicious prevalent softwares like Blaster, Sasser and Mydoom.

The removal tool is not an anti-virus program so it does not have the capability of blocking viruses and infecting your system. But it does work with your anti-virus software program. It is strictly a post infection removal tool.

And installation of the removal tool is no problem because it does not contain any executory file that would be installed in the program files in your computer. The removal tool is activated online. But there are some requirements for you to download and run the removal tool in your computer.

For you to download the removal tool you must have Microsoft Update, Windows Update, Automatic Updates, The Microsoft Download Center, The Malicious Software Removal Tool Web site on Microsoft.com and for you to run it your computer must be on.

The computer must be running Windows Server 2003, Windows XP, or Windows 2000, You must log on to the computer by using an account that is a member of the Administrators group.

So there you go, all the things you need to know for you and your computer to stay connected and virus free.

James Monahan is the owner and Senior Editor of http://www.RemovalSite.com and writes expert articles about removals.

In this time and place, is there anyone among us who does not have at least one email account to their name? I have several email addresses to my name, and each one of those serves their respective purposes.

I keep one for my friends’ emails, another for free e-newsletters, and one as a back up for all my business transaction emails. Now who does not keep an email account? My hairdresser keeps one; even my six-year old niece has an email account to her name!

Email, or electronic mail, started in 1965 as a means of communication for a set of users of a shared mainframe computer. Email came into use long before the Internet was developed. In fact, early email systems played a crucial role in the creation and development of the Internet.

Email then allowed multiple users to exchange messages between different computers. In 1971, Ray Tomlinson, an engineer, introduced the use of the “@” sign was introduced to separate the users’ name from their sending machines. The sign also designated the receiving machine.

Email became popular and known because of its functionality and advantages. But how does this form of electronic communication work?

As you receive dozens of email messages during the day, you need an email client to be able to read them. Many people in offices use stand alone email clients such as Microsoft Outlook, Outlook Express, Eudora, or Pegasus.

If you are subscribed to free internet-based services like Yahoo, Hotmail, and GMail, you are using an email client that is displayed in a webpage.

An email client does the following things: 1) it shows a list of your messages which are already in your mailbox by showing the message headers (the header shows the sender, email subject, and other details such as message size, or the time and date of the message); 2) it allows you to select a message header so you can read the body of the message; 3) it allows you to write new email messages and send them; and 4) it allows you to add file attachments to the messages you send and lets you save the attachments from the messages you receive.

Even if you have an email client in your computer machine, you still need an email server to connect to.

In the simplest terms, an email server works like this: 1) it has a list of different email accounts, one for each person who can receive an email message in the server (examples of account names are psmith, bcallahan, etc.); 2) it has a text file for each and every account on the list (the server has text files in its directory called PSMITH.TXT, BCALLAHAN.TXT, etc.); 3) if PSMITH wants to send MCALLAHAN a message, he would write a text message in the email client and indicate that the message goes to MCALLAHAN, and when PSMITH sends the message, the email client will connect to the server and pass the message sender’s name (PSMITH), the recipient’s name (MCALLAHAN), and the message body; and 4) the server would place the information at the bottom of the MCALLAHAN.TXT file.

For many people today, their email systems run on two different servers called the SMTP server and either of a POP3 or an IMAP server.

SMTP, short for simple mail transfer protocol, handles outgoing email messages, while the POP3, (POP means post office protocol) or the IMAP (internet mail access protocol) server handles the incoming email messages. This is a very simple system, but the real email systems in use today not so complicated than this.

Communication has taken an advanced path through the years. Now, more and more sophisticated systems are being introduced to facilitate fast exchange of messages and documents among different people from different places. And email is just one of these advances which man has learned to enhance and a technology whose perfection is still to come.

James Monahan is the owner and Senior Editor of http://www.CreatingEmail.com and writes expert articles about emails.