It wasn't to remove "malware" specifically. It was to uninstall an unwanted program. Was following instructions I found to delete something called guplayer. Said to use malwarebytes, then follow with ccleaner.
Sounds like malware to me, and seeing as the first two "how-to-remove" hits in my search engine are on sites with bad rep and the herdprotect sites says the guplayer is a application whose installer pushes adware, I repeat you are likely infected and running ccleaner may have been what was wanted by the infector. Go to one of the trusted sites and get a clean bill of health before we try and figure out anything