First make sure your data is backed up.
Make sure your computer boots all devices (i.e. CD-ROM) before you begin.
If not, this can be setup through your computer's BIOS.
Insert XP disk, and boot CD.
Following the on screen instructions, format your HD.
What Antivirus Do You Use?
What is the best antivirus to use for personal pc (please post your opinion)?
I use AntiVir v.6 mainly because it's free and the definitions are updated daily. However, the on demand scan time is rather slow, but the real time scanning is accurate and efficient...