I've actually used this program for a long time and just now discovered the help forums.
The thing is after I use CCleaner I have to uninstall it because if I leave it in my PC I always get an error message during windows startup. Something about memory and that I have to press F2 to load default values.
Then if I load the default values windows loads up fine then I just have to change the date and time (because it will show an old date and the wrong time). So whenever I use CCleaner I install it and then uninstall it again until I have to clean my PC. Is this a known CCleaner bug?