Try Kaspersky, been running it for years without a single problem, I know it's a pain to have to pay for a program but there's something to be said about peace of mind not to mention the hassel of false positives. Just so you know, most of the free antivirus programs were written by the virus writers themselves, they want you think your protected by these false positives all the while keeping your system open to attack from the real threats, you may already be infected and not know it, even happend with me while running Norton.....
