Hiya,
What's the weather been like temp-wise in your area ??
Seems if you got on ok before it maybe heat related (longshot as nvlddmkm.sys cropped up you said)
Try this ...........
Uninstall as i describe (think page 1 etc) and try ............
169.02 -> 169.25 -> and if they still play up try the 175.16
Nvidia are in a state over ATI's new card release (more to come
)
Drivers are gonna be flying out from nvidia now lmao
Out of all the Vista and nvidia series 8 cards you're the 1st one that's had/having probs with a GT (to my knowledge that i know of) , My problem stems from my older 8800gts 640 and most others are the 8800GTX
All's i can suggest is rollback a few driver releases and try (making sure you have got shut of drivers properly)
Delete any nvkddmkm.sys files from inside the system32 folder which is in C:\windows\system32 in here delete the blighters if any remain
Sometimes if one etc remain there, They don't/can't/won't get deleted or altered so nvlddmkm.sys probs occur
Tell you what, gone 12:20am here now, If you can can ya take screenies of these folders for me so i can see whats what .............
System32 but just a screanie showning all the Nv area (scroll down til you get to nv obviously)
And also the FileRepository which is in system32 folder, again around the nv area inside the filerepository
May help me try and suggest something
ps: How are you at getting into motherboard bios etc and changing settings ??? may need a few more Vcore volts or ram could do with a notch raising or even the northbridge volts (reading again i think your rig may have become unstable so could not be the drivers, another longshot but ya never know and a notch of juice through things to varify aint gonna blow ya pc up (trust me i'm nuts) lol J/K))
Could have a crack at that side of things is you're ok at going into the bios ?? or if weathers been warmer maybe just heat related, That many options i can throw around so just shooting from the hip
pps: You aint got OCZ brand memory at all have you ????
Ciao
Def