My computer has been taken over by a pop up called VirusDoctor which shuts down the site I'm on and tell me my computer is infected and I should click to start the clean up. I am able to minimize the screen and get onto other sites like this one, but I'm afraid things may get worse if I don't remove this virus. Does an yon know a way to get rid of this particular virus? I'm not too knowledgeable about computers, so please be as simple in your explanation as possible. Thank you.