Though it has been a week since this thread was active, I don't know exactly where to begin but if you still have use of your CD drive, I believe you should simply put your recovery CD into the drive and reboot your computer. You should then be given the steps to take to restore your computer to the factory specs when you first bought it. I asume you have not added additonal hardware since first buying the computer. You should probably have only your keyboard, mouse and monitor attached to the computer while restoring.
If successful, you will have to reinstall all of your software and whatever else you want.