Quote Originally Posted by Tratorix
I had that problem. Turns out I was using an outdated version. I just had to install the new version from their site and it worked fine. I've been using AVG Free for about a year and haven't had problems. Also, it doesn't seem to lag my computer much, even doing daily scanning.
I've had this problem in the past as well, but not for about a year. Uninstalling and reinstalling the latest version worked for me as well.