“Windows Antivirus 2012 has found critical process” popup message occurs on websites controlled by fraudware developers. They use those resources as means of conviction. That is, they foist off on users their annoying and useless product by forcing them to watch notifications like the one above.
Black hats get most of the visits to websites flashing the message under review thanks to using trojan for modifying browning experience. The infection is a tiny applet injected into computer system. It is compatible with any browser despite its size. Removal of “Windows Antivirus 2012 has found critical process” popup requires user to eliminate relevant redirect module.
If it has progressed as far as to loading the full-feature counterfeit or until you are still on the stage of receiving scary alerts online, apply free scanner available here to remove Windows Antivirus 2012 has found critical process alert and other infections related to the popup.