I currently have Windows XP Pro edition, and would like to start over with a clean install on the same computer, I am not able to locate my old cd’s to prove that I am eligible for an upgrade.

Any suggestions on ways around this?

I have also read about installing a new copy of XP on the same harddrive to co-exist with the other copy of Windows xp.

Any thougts are appreciated.
Thanks
Excellent idea, thank you.