Also, can I add more memory to either of these computers and how much does 1 GB of memory cost? How do I install the memory once I buy it?

First computer:

COMPAQ CQ50103NR – LAPTOP ONLY C1500S1
MODEL CQ50103NR
BUNDLE SKU 135853
SCREEN SIZE 15.4"
PROCESSOR AMD ATHLON DUAL CORE 1.90GHz
MEMORY 1GB
KEYBOARD/MOUSE INTEGRATED
VIDEO CARD NVIDIA GEFORCE 8200M
HARD DRIVE 120GB
OPTICAL DRIVES SUPER MULTI 8X DVD/RW
INTERNET CONNECTIVITY WIRELESS, ETHERNET, 56K
SOUND CARD INTEGRATED
SPEAKERS INTEGRATED
OPERATING SYSTEM WINDOWS VISTA HOME BASIC
PRODUCTIVITY SOFTWARE 60 DAY TRIAL OFFICE STUDENT
VIRUS SOFTWARE 60 DAY TRIAL SYMANTEC
WARRANTY 3 YEARS
GIFT CARD NOT INCLUDED
PRINTER MODEL NOT INCLUDED
PRINTER TYPE NOT INCLUDED
CARRYING CASE INCLUDED
RETURN POLICY NO RETURNS ALLOWED
ADDITIONAL ITEM NOT INCLUDED

Second computer:

DELL PINK 1525 – LAPTOP ONLY D1500S2
MODEL INSPIRON 1525
BUNDLE SKU 135800
SCREEN SIZE 15.4" WXGA
PROCESSOR INTEL CELERON 550 2.0 GHz
MEMORY 1GB RAM
KEYBOARD/MOUSE INTEGRATED
VIDEO CARD INTEL MEDIA ACCELERATOR X3100
HARD DRIVE 80GB
OPTICAL DRIVES 24X CD-RW/DVD-ROM
INTERNET CONNECTIVITY INTEGRATED
SOUND CARD INTEGRATED
SPEAKERS INTEGRATED
OPERATING SYSTEM MS WINDOWS VISTA HOME BASIC
PRODUCTIVITY SOFTWARE MS WORKS 9.0
VIRUS SOFTWARE PC-CILLIN 30-DAY TRIAL
WARRANTY 2 YR LIMITED WARRANTY
GIFT CARD NOT INCLUDED
PRINTER MODEL NOT INCLUDED
PRINTER TYPE NOT INCLUDED
CARRYING CASE NOT INCLUDED
RETURN POLICY 7 DAYS FROM RECEIPT, UNOPENED
ADDITIONAL ITEM NOT INCLUDED