I upgraded Avast to the newest version, and upon completion, it required a restart. At restart, I get the BSOD. I tried unistalling avast while running in safe mode, through the control panel, restarting, then downloading a fresh copy from your website. I reinstalled avast, and I still have the same problem. I also then uninstalled avast via the removal tool on your website, then did a clean install again with the same results.