OK, I haven't installed anything recently, and all-of-the-sudden, my computer stops responding, and something comes up saying "SYSTEM has stopped responding". It looks like Windows and everything, but when I click the X, a pop-up comes up leading to a rogue anti-virus software.
AVG has done everything but it gets back onto the system every 5 minutes.
Wtf should I do?
EDIT
The pop-up links to some download for "SpySheriff". I know for a fact that it's rogue, because of it's reputation on Google.