It just so happens I ran across a tool yesterday that claimed to do exactly this called Inzider. I can't really vouch for the safety of the product, but it looks pretty harmless.
http://www.bahnhof.se/~winnt/toolbox/
~~~~~~~~~~~~~~~~~~~~~~~~~
Jon Speer
IS/Research Engineer
503.276.7578
Tripwire Security Systems
1631 NW Thurman
Portland, OR 97209
877.TRIPWIRe
