I have had FSX for about 2 months now, and initially had no problems. After about 3 or 4 weeks of use, it starting crashing without warning in the middle of some flights. It doesn't happen every flight, and it can very from crashing at takeoff to landing. The computer simply restarts itself and a message appears 'The System Has Recovered From A Serious Error'. The crashing does no damage whatsoever, - no files lost or anything other than the flight i'm in the middle of. I'm running Windows XP, and as far as I can see, I have all the required running specs.
My computer specs:

Thanks
Will