Basicly, GW will run fine, no problems, for hours on end. When I stop playing and close GW, the computer just reboots straight away - as soon as you hit that exit button. When it has restarted it comes up with a serious error message (asks to submit report etc). This happens pretty much every time I play, although very occasionally it doesnt happen, but I cant see any connection between these times (like there is no connection with how long i play for, its happened after both long and short sessions)
Ive tried reinstalling GW, but that hasnt fixed it, and I dont really know where to go next... im not a computer boffin!

So yeah, any ideas what this might be? Im getting quite annoyed having to wait for the computer to reboot, and it cant be good for it (it says serious error after all!! :P)