Today I made an update with an optional fix of Microsoft KB938828. I think it fixed some issues of the internet explorer 7. Then I updated my Office 2003, the Office Update side of Microsoft showed me some new fixes which I had never seen before. At least I installed the new graphic driver of Nvidia for Windows XP Vers. 162.18. Then I started JV16 PowerTools 2007, the RegCleaner. And oh wonder - it works without any problem!!!!!
The real reason, why it didn't work before I don't know still. I think it is the Microsoft optonal fix KB938828.
Maybe this will help you. Please let me know if you get success.
Vangeli