I use CCleaner for a long time without problems (Windows 7 32 bits). Recent weeks and despite the passage to the latest version (3 22 1800) I can not clean the registry: I have a error window and everything stops after a few moment.
I'm having the same problem with an identical error message. This problem started with version 3.22.1767 and the last working version was 3.22.1750. Selecting "Unused File Extensions" is the culprit on my machine.