add this stuff to Gecko's list
You'll need a program call Magic Jelly bean, to get the product key off of the computer being repaired. Most of my clients haven't got the foggiest of where they put their product key

.
If its fat32 there is a program called "diag" that might be on
www.bootdisk.com. that will pull the product key from a dos floppy boot.
Most of the hard drive manufactures have a floppy boot hard drive test disk--should be a free download.
Norton Utilities 2005 (run from the cd) is good cleaner upper as is "Crapcleaner."
Install the google tool bar, its probably your most powerful resource for finding drivers and what all that you will need. Bear in mind that there are several ways to describe something. Google does a good job, but type in "miserable failure" and your first hit will be Pres George Bush , so go figure.
Download a copy of "emule," and explore the site for tools you would like to download. Many a system I've worked on, I could pull the product key and the owner no longer had the install cd

. You might pick it up here.
A copy of Ghost 8.0 to transfer the old drive to the new drive.
And there is this
It should light your wick
Good luck