Yep....
It gave me 3 free Trojans in the download......
I removed them with AVG and un-installed "C Cleaner", pronto!......
...
Where did you download it from? I've used CCleaner for a long time. I never had a problem with trojans. http://www.piriform.com/ccleaner/download
..goodness knows?...

I do the usual Google search for C Cleaner, pick one and download and install it, and run it...
After a while I detected that the computer seemed to be slowing down generally....did an AVG check..as I do, regularly. It came back with the report of 3 Trojans associated with the C Cleaner File, and quarantined them.
Rather than take any more risks by running C Cleaner, I uninstalled it, and use Easy Clean and Registry Mechanic instead..(Does a similar job).
Paul.
BTW: Did an overnight Memory check, all OK, but I'm still getting the "freezing", at intervals, a bit annoying!... :-?...!