I think i have a driver problem

, my systems is
P5KD
E6600
2x1 Gb OCZ reaper pc9200
8800gts 640mb
creative xfi extreme music
It will run orthos over night 8hrs + no problem but if i leave it on say downloading ( i.e idleing) when i get up vista has crashed, i have to turn the psu off/on reboot and start window normally. Im running the latest 8 series drivers form the Nvidia web site (158.24)

also when i uninstall the driver i can not get into control panel untill i reinstall it
Has anyone had this problem ? i would be greatful for some help
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