Do you have an XP CD?
If so, put it in the drive and from RUN type in SFC /scannow
Do not forget the space between / and scannow.
This will check your operating system, and replace any files that are in error.
There are various uninstall programs ( this is an example) click here , that will remove cccleaner (enabling a clean install)if you want, howver I have not tried this program, and cannot say if it is any good or not.