One time I accidently removed game data off my pc with Ccleaner. How do I increase my system's performance with Ccleaner and not removing valuable files?
I'm pretty sure if you delete temporary files category it will corrupt your game date files.
Normally your game saves are stored under your username you logged in as. Those shouldn't get touched by Ccleaner. The temp files for browsing and windows install junk can/will.
The only way CCleaner will affect your game files is if you go into tools and purposely uninstall the game. Using the cleaner itself or the registry cleaner should not delete anything important as long as you untick the boxes that you do not want to be affected.