Twice in the last month I have picked one up, where you are clicking on the link what ever it may be, and this pretend virus scanner comes up on your screen. It then locks out your ENTIRE system, everything, and the only thing you can do or go is to their website to buy there so called antivirus software. These scammers reallly annoy me, becasue they prey on the poor unsuspecting people who dont know any better and buy their so called software and then they have your personal details about everyhting, even your IP address.
Both times I had to restore my system, not that it was hard to do, just very annoying.