I am also having the same issue for the past 2 days.
CCleaner Free
v5.21.5700 (64-bit)
CLEANER
Running Cleaner
Stops at 45%
System
Windows Log Files
(These are the files usually before it scans Firefox)
Error Message:
CCleaner has stopped working
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available.
REGISTRY
Registry cleaner does work.
Any help would be greatly appreciated. I even did a new download and install and get the same message.