From Eusing Software:
Eusing Free Registry Cleaner Portable is a free registry repair software that allows you to safely clean and repair registry problems with a few simple mouse clicks. After scanning and fixing the invalid entries, your system will be more stable and run faster. For maximum safety, Eusing Free Registry Cleaner will make a backup of the repaired entries. You will be able to restore any changes made using the software by choosing Restore registry backup.
What's new in this version:
Version 3.6 adds some ignore keys.