Can anyone explain why and possibly produce an answer as to why my dads computer freezes all the time. If you leave it for 30 seconds whilst there is a window on screen it will freeze. I've managed to find a way to stop this happening, but it involves closing all windows, making sure the broadband connection is on and setting the monitor to 30 second power save. As you can imagine it's pretty infuriating.
I know it was caused by formatting the hard-drive (following a virus) but i'm sure i reinstalled all the drivers and hardware properly.