Shocked Again

Wow - what an embarrassing mess. Sorry, I have a lot of forum message reading to do in effort to catch-up on what is happening. Just venting: I am shocked, today's experience with CCleaner is embarrassing. My system just spit-out a quick error message, then CCleaner disappeared. However it left some program running in the background. Got concern a virus etc was involved.. All efforts to reinstall failed (current and a couple past versions)... Tried several thing but was only successful by killing CCleaner mystery background process, removing Program file/CCleaner dir... installing 5.39 p