This looks like a good opportunity to advertise Total Uninstall (
http://www.geocities.com/ggmartau/proje ... jects.html ) Not really advertising - it's free and I certainly don't make any money from it. TU will only delete folders/files created at installation but it won't help you now, after the fact.
I'd go with ozzy's advice. Assume you're going to lose everything and back up everything possible first.
Tipster, you've been reinstalling for a week now. I did a total uninstall of XP, reinstall of W98 and all my apps in a day or so. What's the problem?