Not Winders, but my Mac managed to find a download of MacKeeper from somewhere, not my doing, I suspect it was wrapped up with an auto update from Apple or Epson. However it made itself a total nuisance nagging me to dump files but not saying what. It also appeared incompatible with the Bitdefender scanning tool which considered it malware . The Bitdefender tried deleting the MacKeeper but could not , after quite some time of running the scans Bitdefender has just found a way and dumped MacKeeper off my machine, I assume it learnt the way to do it and gave it the big E