Deep cleans the registry. Set it up and it does all the work. I love it! Use it once a week.
Sweepi http://www.snapfiles.com/reviews/Sweepi/sweepi.html
Clean up tool. Deep cleans better then any other cleaner I've used. I love it! Use it once a week also.
Malwarebytes Anti-Malware http://www.snapfiles.com/reviews/malwarebytes-anti-malware/malwarebytes.html
Cleans and Protects your computer from malware!
Excelent stuff!
Cleaning/optimizing your registry can be dangerous. Even if you set a system restore point, you could do irreversible harm to your PC. Be very careful and only delete what you know is safe to delete.