Eelie id still advise to do a sys scan you can do it manually .....
Start, programms, accessories, system tools...
Im sure there is someway of setting it so it will scan if you switch it off at the wall. Cos im sure it damages the disk in time.
The scan disk will repair any physical abnornalities on there.
What options does it give you when you want to shut it down??
You press start , shut down , and then what ?