W7 HP 64 bit IE11. Recently had a glitch where there was a partial bootup, desktop was blank with no tray area displayed. This came after a couple of weird bootups in the preceding few days. Tried the f8 key, just in case. I left the machine for some time to see if there would be any further developments, but nothing else happened. I restarted using the power button to get to limited functionality via the f8 key and used the System Restore function to go back a couple of weeks or so, which solved the problem, and the computer has worked fine since then. I know it is not good to shut down this way, but I know of no other option. So, my question- is there a keyboard command to restart? The ctrl-alt-del combination does not do that on W7.