That's really weird. I think I'd scan for malware first. Do you mean that Programs and Features won't open, or that trying to uninstall any program from the list doesn't work? You could try running "sfc /scannow". Also, you could try System Restore (not a fan personally, but it can work). I think I might try running the registry cleaner in CCleaner, too. (Is this the machine that was locking up? Did you get the new proc put in?)
I haven't put in the new CPU as of yet, but I plan to do so in the next few days. I tried both the malware scan and CCleaner, but no luck. Rather than fool with a System Restore, I've backed up all my data files, and as soon as my backup drive finishes defragging, I'm gonna reinstall Windows 7 from the get-go. Normally, I'd wipe the drive first, but to save time, I'm gonna use Partition Assistant to erase the partitions from a bootable CD-ROM, and then proceed with the reinstall. Thanks for the suggestions!