Verified answer

boot up with the system disk, and just do a fresh install - it should reformat the partition as it goes.

Re-formating your pc and re-installing all your programs sounds a very drastic way to remove a worm. Try an online scan to confirm that it is a virus/worm that's causing you problems. If it is, you should be able to remove it without doing anything so drastic. If it's not, a re-format & re-install may not solve your problems anyway.

If you want to wipe the drive clean and reinstall, simply boot from the XP CD

Delete all 'partitions'. This is very important!!!

Then format and install Windows in the next step.

you will need windows installation cd for that

http://mypchelp.blogspot.com/2006/10/windows-reins...

go to command prompt make sure you are on c:\> and type in format c:\