Sorry for the delay, it's a bit hectic in private these days.
if you are experiencing 100% CPU load while a game is running, this is not unusual. This is supposed to happen.
Crashes however is a different thing, it might be a good idea to update your graphics card drivers if possible.
Got to: Start>Right click 'My computer'>Properties>Hardware> Device Manager> Display Adapter or Graphics card.
What does it say? let us know the name.