|Ccleaner slim has a safe registry cleaner as one of the modules included in the program. Get it at the link in #3.|
Just to be safe, when asked if you want to create a backup do so. I usually save any backups to the desktop where they are easy to locate, should you need it. I have NEVER needed one. After you are sure you don't need the backup just delete it.
The cleaner module is excellent. I use it daily.