PC Freezes and BSOD's

been having BSOD and Freezes for the past couple of months.
I did a Memtest and found some errors but is not consistent. when i discharge computer and check again there is no errors.
i have 2 sticks, when i get errors how can i know which DIMM its referring?

also, i tried to reattach an 8GB partition to a 40GB partition which made it Dynamic Disk
i think it started around this event.

i know its not related to the OS because the computer is also stuck at post sometimes and also froze in bios once.

I get it allot when i watch YouTube videos at 1080P, but i don't get it when watching 1080 movies or playing games.
so i'm not sure if its Graphics card related.

i've attached all BSOD and hope you can assist finding the problem.
i suspect SYS BOARD.

Minidumps

Your crashes are all over the map, before you start testing the ram I would remove Norton and replace with MSE at least to test. Norton often causes problems like this


Symantec is a frequent cause of BSOD's. I would remove and replace it with Microsoft Security Essentials AT LEAST TO TEST


http://us.norton.com/support/kb/web_...080710133834EN

Microsoft Security Essentials - Free Antivirus for Windows

as i said earlier.
this can't be a software issue as the computer froze at bios! and also stuck at POST.
Plus, this version of Symantec is also install at my work on 50 computer with no problems at all.

i'll try uninstalling Symantec and installing Avira antivirus instead.
but as i said, i don't see how a antivirus can have an effect on the computer at POST or at the BIOS.

+i did a CMOS reset and the computer looked good for few days until it started again with its shenanigans.