Back up is to be on the safer side but these computer cleaning software's do not require any back up policy as they don't delete anything. It will delete the junk files which are causing 'PC slow' problems.

I do agree the solutions which are presented here for the PC related problems. In fact, when my PC is running slow, I cleaned the registry with the help of the computer cleaning software and then only my problem get solved.

http://www.ninjatuneup.com/ free trial was awesome for me. When I was facing a slow PC problem and not able doing any work then I tried ninjatuneup and it helps in my PC boots up. And also I would like to thanks

I was using this method before downloading the Ninja TuneUp. Now i use to clean my computer registry with just a click of a button. You can also download it's trial version from http://www.ninjatuneup.com/download.php