John's right. Re-installing is often the quickest way to solve a problem.

If you make a safety copy of the Power Tracks folder, all you need to do is delete the Pt folder and replace it with the safety copy - about three minutes, as John said. All the plug-in registrations would be preserved.

It's a good idea to keep your VST folder in the Pt folder and then, if you have any problems, the safety copy will re-load those as well.

ROG.