Im running windows xp, and yes it was the same the message, as before, but since i posted the topic i have taken out my sound card and removed the drivers and this has made my gaming a lot smoother and most of the jerkiness has gone, and it didnt crash on the game that i was playing, that crashed in the same place twice, it didnt happen this time, but as yet i am not totally covinced this will cure the problem, also I had this problem before i changed my power supply but after putting in a 450 watt all seemed to be well for the last few weeks untill today, with the old ps, my comp would just restart when i was in the middle of a game, and though I think the ps did cure the restarting i dont think it has cured as yet the blue screens, I will be keen to see how taking out the sound card will change this matter as already i can see a definate change in the quality of performance in game, and has reduced jerkiness dramatically. Thanx again for your help and your time for helping me, as any suggestion would be greatly apreciated.