Multiple BSOD's - Unable to reproduce

My Dad's pc was running solid for about 3 years but it started to blue screen randomly this August. Did a clean install of Windows last October. The system had a malware infection at one point but I can't remember if that was before or after I had re-imaged it.

Troubleshooting performed:
Reinstalled video drivers (system was blue screening when launching ecabs at one point)
sfc - no corrupt files or integrity violations
crystaldisk - drive health good
memtest - 12 hrs no errors
prime95 - 12 hrs no errors
OCCT - errors on core 3
-Disabled turbo boost in bios
-reran OCCT - no errors (large dataset 1hr)
chkdsk - no errors
chkntfs - both C: and D: clean
Ran Driver Verifier (unchecked low resources simulation) 48 hours no blue screen

OS: Win7 Pro x64
AV: Avast
Mobo: MSI P55-CD53
CPU: Intel Core i5-655k
Memory: Patriot 2 x 2GB PVV34G1333LLK
GPU: PNY Quadro FX580
PSU: Antec EarthWatts EA-380D
Optical Drive: Asus DRW-24B1ST/BLK/B/AS
HDD 1 (OS): WD Blue WD5000AAKX 500GB
HDD 2 (Backups/Data): SAMSUNG Spinpoint F4 HD322GJ/U
PCI: US Robotics 56k Card

Hello,

Please follow the Blue Screen of Death (BSOD) Posting Instructions so we can get the appropriate files that we need.

-Justin

Hello, Thanks for posting up the files.

From the crash files, it's blaming the memory for every possible cause:

Code:

Probably caused by: memory_corruption

Lets run a RAM - Test with Memtest86+

   Tip

Remember to run this test for a minimum of 8 passes!

Post back results.
-Justin

Post up the new crash files so I can take a look at those too. Just to make sure that there isn't anything else going on.

You do not need a clean install of windows. You will need to test 1 stick at a time though.

I had almost dismissed your suggestion to run memtest as it had already been done once, but then I remembered I never saw the results just that he said there were no errors.

You can do what you please as we can only make suggestions. However, I believe if I go to a forum full of experts I'd take there suggestion even if it has already been done for their personal cross-off list. This way they can narrow it down to what they have seen in the past.

-Justin