Crap Cleaner
Yes it is called Crap Cleaner. This is a freeware system optimization tool that removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! Pay close attention to all the settings so you know what you are getting rid of before you run it.

User Profile Hive Cleanup Service
The User Profile Hive Cleanup service helps to ensure user sessions are completely terminated when a user logs off. System processes and applications occasionally maintain connections to registry keys in the user profile after a user logs off. In those cases the user session is prevented from completely ending.

ERUNT and NTREGOPT
ERUNT is a utilty to backup and restore your registry. NTREGOPT is utilty that optimizes your registry