Ok, I've read the 8 step plan and done everything on it - rebooted after reinstating AVG and there's still a "Common" folder up when I reboot, with a single file, helper.sig in it (which has been the case the whole time.) The symptoms I'm having are a really slow computer (opening applications especially), random and spontaneous restarts, and of course the Common folder with "helper.sig". Please help!! Thanks for all you do guys.