The proper name for this is a Rogue Program... It acts as something else. And most of the time these rogue programs will get you to buy something and then it will disappear for 6 months as if you actually bought something. Then it will come back with the same message as before yet the last time you paid and it went away so you keep paying for the "service" because it gets rid of this program. The only real way to get rid of it is get a malware extractor.