Randomly, my computer will freeze up, the screen will distort, any sound that is playing will loop, and then it will BSOD. Temperatures are not an issue, and I have run memtest and Windows 7's memory checker. After the crash, my avast! Antivirus will be broken, and I need to repair the installation. Programs won't start, and I can't even access my control panel. It's very annoying, any help would be very much appreciated. EDIT: I also updated my Catylst and Display Drivers yesterday, uninstalling the old ones.