It's a long story: I had a problem with my BIOS, so I had to take my pc to a informatic technician: he solved the hardware problem, reinstalled my OS and, without ask to me, he installed Avast AV free. Now, I can't unistall it !! I ran many times the Avast tool to unistall, in Safe Mode, but it freezes every time ! No other security program installed in this moment, so I can't understand. Help me please !