I've had various problems in the past, but have kept with CCleaner.
I think I've isolated them now.
If Secure File Deletion is checked, CCleaner appears to get in a ****** contest with various system operations and apps that use the C:\users\xyz\local\temp, yada, yada, yada. Other folder trees too, depending. Sporadic.
it puts windows (7, 8.1) in lobotomized mode and a manual power down is the only recourse.
You guys might want to do some analysis on this. It's a definite gotcha.
I'm guessing it's an OS bug. Windows in general doesn't seem to be very forgiving of certain classes of file system errors. It seems to get into deadlock situations far too often for a 'mature' OS.
