Just reformatted. Fresh install of Windows 7 Home Premium 64 bit. Was installing windows updates. Installed the recommended driver update for my video card (radeon hd 6670 1gb) and it appeared to install successfully. After rebooting, windows only got as far as loading an empty desktop background with no icons or start menu bar. ctrl+alt+del turned the screen black, I still had a cursor. Had to do a system restore. Got driver from AMD's website instead, same thing. Tried their auto-detect driver tool, it pointed me to the same driver I tried. I tried an older version of the driver for my video card with identical results.