How do I get rid of a program called "Pro PC Cleaner" which was downloaded to my Windows 8.1 through another program. I've seen it suggested this is a "legitimate" program (which I dispute as I did not request that it be installed, it was done without my knowledge) and that it can be removed through Control Panel. However, when I try to remove it through Control Panel, I get an error: "not marked for removal".
Norton indicates that it has been quarantined, but it has quarantined it twice in the last 3 weeks which tells me it keeps coming back.
How can this program be completely removed?