BSOD ntoskrnl.exe, HDAudBus.sys bugcheck code 0x00000050

[bladeson]

Hi,
I've been getting this BSOD for almost 2 weeks, its almost always the same error, the BSOD says win32k.sys caused the crash, but when looking at the dump files using BlueScreenView, it points to ntoskrnl.exe or sometimes HDAudBus.sys

I have done the following:
Updated all the drivers i can find (Including the audio drivers)
Ran memtestx86 for 5 passes with no errors

From my search it looks like Bugcode 50 is related to a faulty ram, but I have already ran memtest with no errors, so I'm not sure what to do.

I have attached a zip file with 12 crashes and msinfo32 txt and nfo

Thank you

 

[x BlueRobot]

[COLOR="red"]BugCheck 50[/COLOR], {fffff900c2161000, 1, fffff96000092364, 0}

Could not read faulting driver name
Probably caused by : win32k.sys ( win32k!sfac_GetLongGlyphIDs+84 )

Usual causes:  Defective hardware (particularly memory - but not just RAM), Faulty system service, Antivirus,  Device driver, NTFS corruption, BIOS

Update BIOS (if possible):

American Megatrends Inc. 5.43, [COLOR="Red"]9/10/2009[/COLOR]

Memory:

• http://www.sevenforums.com/tutorials/105647-ram-test-memtest86.html

Run Memtest86+ for least 7-8 passes, and preferably overnight as it can take a while to fully complete.

Test each RAM stick individually, if an error is found then move the same RAM stick into the next DIMM slot and test again, if errors are found for the same RAM stick in every available slot then you have a faulty RAM module. On the other hand, if no errors are found in the next slot or the other slots for the same RAM module, then you have a faulty DIMM slot.

Test each RAM stick and every motherboard DIMM slot available.