Moving File + Playing Tribes:Ascend (New installation)

[Memhave]

I seem to get blue screens when moving files on my PC, I noticed the follow STOP titles before it finished dumping (These may not be accurate):

SYSTEM SERVICE EXCEPTION,
ATTEMPT TO EXECUTE NON EXECUTABLE FILE/MEMORY (Cant remember which)
(None).

I did complete a MEM test on the previous installation and it came up clean, but if needed I can run it again.

 

[Memhave]

Just got another one, I was downloading games with Steam.
It was titled an attempt was made to execute non executable memory.
It was at 0x000000FC, I more information from the windows has shutdown from unexpected error etc:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 2057

Additional information about the problem:
BCCode: fc
BCP1: FFFFF900C23377C0
BCP2: E820000057B60863
BCP3: FFFFF8800A68F860
BCP4: 0000000000000002
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\081712-37518-01.dmp
C:\Users\Peter The PC\AppData\Local\Temp\WER-47237-0.sysdata.xml

 

[Memhave]

Not sure if this is related, but when my external hard drive (I suspect) now causes hangs when attempting to enter BIOS and it wont boot windows when plugged into the front USB ports. I plugged it into the back and it seems fine (havent tried to restart). Could this hard drive cause BSOD + hanging at POST screen, if so is it because its failing or malfunction on the motherboard?