CCleaner Professional hangs up

CCleaner Professional hangs up when started. It locks my computer to the point I must do a hard shutdown.

When starting the program it opens the main screed, then the screen goes black (this repeats about 6 times then stops with a blank white screen.

There is no error message or anything. It just freezes the computer.

Boyd Borden

Can you give a few more details such as which operating system you use.

What security software you run.

Was this updated from a previous CCleaner version.. if yes, how?