Only thing I can suggest is a fresh install of Windows. I used to love Norton until they went with a one disk "internet security" instead of 2 separate disks for antivirus/firewall. The combined program was like a virus itself. Had good luck with AVG for a year then it did same thing and missed some virus. Tried Trend Micro for 2 years but the interface was difficult to use, but did seem to work fairly well until I got a new mouse. After that it would randomly stop my mouse from working until I would turn off the Trend Micro & back on again. Weird. I've been using Kapersky for a year now. Can't say the interface is any easier, but seems to work ok, will be updating it again for another year since I don't have any major problems with it. I do hate the newer software that doesn't let you run Adaware and Spybot at the same time though.