I have been having a rash of BSOD over a period of many months. I began having BSODs (ntoskrnl) during alt-tabbing(while gaming) and on wake-up from sleep. It seemed to not happen if I disconnected my 2nd monitor. So I figured my vid card was starting to go. So I swapped cards. Problem went away for awhile, then nvlddmkm bsod on sleep-wakeups, so that pointed to the swapped vid card drivers. Reinstalled those and I was good for days. Had some BSOD related to my webcam drivers, which I have had problems with in the past, so I reloaded those as usual and I was fine(lvrs64 bsod). Then a BSOD Relating to an Motion Enjoy ps3 controller driver on sleep-wakeup, uninstalled then I was good for 3 or 4 days. Have had one hal.dll w/(ntoskrnl) bsod during normal use (using browser). And now just recently nvldd w/ntoskrnl bsod again on wake-up, which is pointing back to vid drivers? 
These bsods don't happen every day or wake-up, sometimes they can go 4 or 5 days with no problem.
You can check the dump files but the codes are mostly 0x0000003b, 1e, and d1
Ran memtest 86 for 12.5 hrs with no errors

These bsods don't happen every day or wake-up, sometimes they can go 4 or 5 days with no problem.
You can check the dump files but the codes are mostly 0x0000003b, 1e, and d1
Ran memtest 86 for 12.5 hrs with no errors
My Computer
At a glance
Win 7 Pro 64-bitCore 2 Quad Q9550Nvidia Geforce GTX 260
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- CyberPower
- OS
- Win 7 Pro 64-bit
- CPU
- Core 2 Quad Q9550
- Motherboard
- Asus p5n-D
- Graphics Card(s)
- Nvidia Geforce GTX 260
- Antivirus
- MSE
- Browser
- Chrome