I keep getting an alert saying that I have a programe working in the background and my passwords and accounts could be in danger. Vista antivirus keeps popping up asking if I want to purchase the full programe now to get rid of the virus. I do have Macafee which I purchased and it tells me my computer is safe but my Internet is crashing. I have had to use the iPad for this as I can't get into my PC. Anyone have any ideas please.