I just finished updated avast free on Windows 7, and it prompted me to restart my computer. After restart, my desktop appeared without any icons, and a windows error message stating that windows could not find my "Desktop" folder. I then tried to restart the system but accidently hit the sleep button instead. After trying to initialize startup again, I have found that I have an entirely black screen, and that absolutely no video is being shown through either the onboard motherboard video, or through my external video card. Has anyone had such a symptom as this?