Unstable Freezes Blue Screen Data Dump

I recently used a VISTA compatible utility (TWEAK VI) to sort and clean my registry. I then added several new applications, including Office 2007. My system has now become very unstable and often freezes, does a blue screen data dump, or just shuts down with no explanation. I am to far removed from the registry clean to reach a restore point for it, so I am hoping there is a repair option on the VISTA install disk, like the XP disk has. So far the only option I find is to reinstall the whole program.