writeaway, I'm totally in agreement with you about not wanting to screw up a sweet-running machine, so I'll take your advice and leave the extensions alone.
I did, however, let CC clean all the other registry categories, but not before I verified that EACH AND EVERY ITEM LISTED (Type Libraries, Application Paths, etc.) did not, in fact, exist (yes, I followed every path). This gave me the confidence to let CC do the cleaning, and I've had no problems.
Thanks.