I have recently had a problem with win xp pro. Windows File Protection comes up saying a vital file has been replaced. So i entered the cd as it asks. But the message came up every few seconds. I decided just to format and re-install. But the same probelm happens again. I just left it for a while(clicking cancel) but then eventually i was unable to start windows and had to re-install. Is this a virus ?? Each time the only update i installed was the one to fix the RPC virus thing. What is happening?? Help me please !! Thank you.