For some odd reason, my CCleaner Pro is throwing a message when I try to clean: "A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available." What gives? I've uninstalled and reinstalled and still get the error.
OS version?
CC version?
AV software?
run CC with the /debug switch and see if the output sheds any light.
also don't forget, being a Pro user, you have priority support directly from Piriform.