[Talbain]

First of all, you probably don't need any security crap on your computer, as it's possibly what caused the problem in the first place. If you want security, use something like CCleaner to clean out your registry every once in awhile, and don't browse in places you shouldn't (which is to say, don't go downloading serial keys from random websites).

Actually, CCleaner does something like what you're looking for. Not quite, but close. It tells you which registry entries are no longer being used by anything (which is to say, no longer connected to external files). Might be a good place to start at least. Then again, if you're getting registry errors, as long as they aren't nuking your system (and if they are, you might be better off with a fresh install), you should probably just use CCleaner to remove them from your computer.
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