I'm Scared

So I'm about to try to use the restore disks on my computer. A while back it contracted (lol good way to put it) a virus that completely destroyed it. My ex Brandon said "Oh yea baby I'll fix it for you" yea, right. So whatever, I have 3 days left to "activate" windows before it shuts down so I ordered the restore disks from gateway for $20. They came in the mail, yay. On the disk itself, (it doesnt come with any paperwork, or a simple manual btw) it says Use this DVD to reinstall hardware, drivers, selected applications, and your operating system. Insert this DVD, close all programs, restart your computer, then follow on screen instructions. Warning: The restoration process erases all data and files from the hard drive.
Seems simple enough right? I'm going to attempt to do it tonight, wish me luck....