I have certainly changed CCleaner CCL64.exe 64.exe for me and it worked. There seems to be a program that is blocking it. All I have recently installed a "patch" called KMSpico, which was not detected by KAV as virus or anti-malware by Malwarebytes.
Thanks for your answer.
Since a few days and try to run CCleaner does not start, which is not the problem, only happens with this program. I have Windows 7 64bit, Comodo Firewall and KAV.