How can I find out what everything does in the windows section, What to check not to check

CCleaner for Windows
1

When you run cleaner it has options on what to check, i ws wondering how could I find out what each does so i know if i want it checked or not. Thanks

2

Have a read here Joe, then come back if you need to know more :)

http://www.internetrotsyourbrain.com/ccleanerbeginnersguide/