Upgraded gx60 to 1 gig recognized upgrade ok. Computer has started running very slow and choppy. Taskman says CPU usage stays between 60 - 100% with nothing at all running. It shows 30 processes none drawing much use except for the taskman itself which is drawing between 50-80% at any given time.what could cause this excessive strain it the slow choppy running. This machine ought to fly. 2 ghz. Intel celeron 2 stepping. 1 gig ram