Random BSOD: BCCODE 50

Hello all,
I am getting BSODs and I do not know what else to do. I tried everything that came up to my mind. Brief history of the issue:
Had Windows Vista installed and decided that would be good to update to Windows 7. I replaced my old hard drive (fully functional) with a SSD (just for the OS) and a brand new 2TB HD. BSODs started coming up randomnly: playing video, browsing the web, doing nothing..... I tried debugging this issue from a HW point of view: disconnected the video card (the motherboard has one built-in), removed half the RAM (then put it back in and removed the other half), replaced the new drives with the old one and re-installed Win7, etc... the only thing I could not remove was the motherboard and the processor. From a software point of view, I re-installed Win7 several times and updated all the drivers in the system. Last thing I tried: put in the old HD and re-installed Windows Vista (just what I had before I decided to upgrade the system). In all cases, including the last one (Vista), I get random BSODs.

I followed the instructions and generated the required reports. Please find them as attachment. Also, I zipped the info that comes up next time Windows starts after the BSOD (the last 2 times that happened).

I have Windows 7 Professional Edition 64b SP1. Computer is about 4 years old:
AMD Athlon Dual Core BE2400 2.3GHz
RAM: 2x2Gb
Nvidia GeForce 940GT
Motherboard: GA-MA69GM-S2H

I really need help. Thank you very much in advance.

Hi panais,
I followed your instructions and everything looks good so far. I will run memtest overnight and will post again tomorrow morning.

Avira was on the system because I thought the BSOD issue had something to do with the antivirus I had before: AVG. Not a big difference though. Hopefully MSE will work better this way.

Updated driver successfully installed.

sfc /scannow command did not report any errors.

I will post memtest results tomorrow morning and, assuming everything works fine from now on, I will post again to confirm it 48 hours later. If the BSOD event does not show up in 48 hours, I am confident the issue is fixed.

Thanks a million!!!

Hi panais,
I am afraid I am still facing the same issue....memtest reported no errors after 8 hours running. However, I left the computer downloading some files and the BSOD showed up again. Attached files with info for experts.

Any suggestions? Thanks a lot in advance!

and new crash.....

guys/panais.......anybody out there???

Hi panais,
I enabled driver verifier and did not notice BSODs more often than as usual - every 24 hours or so if I do not switch off the PC.

Dump files attached......hope they contain usefull information to debug the issue.

Thanks a million!!!

Run Prime 95 to test your CPU. Carefully the instructions in this tutorial: CPU - Stress Test with Prime95. Run 3 separate tests, one on each of the settings (Blend, Small FFTs, Large FFTs). Post back with your results.
Note that this test may overheat the CPU, ensure proper cooling