BSOD frequent but at random (PAGE_FAULT_IN_NONPAGED_AREA 0x00000050)

Dear sevenforums members,

At last I have to accept that I am not able to find and/or solve this issue myself. I keep getting frequent (multiple time per day) BSOD's, but to my knowledge at random occasions. I will add all asked information, dump files etc. And I will also give an overview of what I have tried myself. If one could help me out, that would be very much appreciated as I have reached my own limits of problem solving. My computer used to do a restart after each BSOD, the last weeks even the Blue Screen freezes, which may corrupt the dumpfiles (?).

Specs:
Fujitsu Siemens Amilo Li 3745 Desktop
Windows 7 x86 Home Premium (update from vista)
NVIDIA® nForce® 630i (MCP73-PV)
Intel® Core™2 Quad Q8300
Nvidia GT120
2x 2GB DDR2 SD-RAM
2x WD Harddiscs (1TB + 500GB)
Approx 4 year old.

Work done so far:
I used the windows build in checks for both RAM and HD's, I ran memtest86 for 12 hours (no faults), I have ran the system on either RAM chip alone, I installed windows on a new HD and disconnected the old one. I have tried to update most drivers. Read many threads about BSOD's but did not yet find the ultimate solution.

All of them pertain to NTFS issues. Has this been occurring even with a fresh new copy of Windows? If so, you may wanna do the following:

• Update your BIOS. If your BIOS is up to date, reflash it ("reinstall" it). BIOS sometimes can get bugged.
• Update all your motherboard drivers from the OEM vendor's website, especially those relating to your drive controller (may come a driver suite for your mobo).

If those two do not resolve the issue, most certainly we're dealing with a failed motherboard, which are nearly impossible to test without a motherboard testing kit. Unfortunately, because the system is so old, most likely your warranty for it has expired. You may be able to find an exact replacement board, or you may need to just purchase a new board.


For other miscellaneous checks, you should look into:

• Uninstalling/updating Nforce System Management Controller Driver (I believe it's part of the Nforce chipset driver suite). It's dated 2007 right now, so something should be done with it.
• You have some miscellaneous OEM PC Camera driver (snpstd.sys) that's really old (2006). Uninstall it or update it.