BSOD WHILE PLAYING fifa 13 AS WELL AS WATCHING MOVIE

hi there,
m new to this forum. I replaced my msi mobo with gigabyte GA-78LMT-USB3. And after formating and updating my new driver, i get BSOD while playing fifa 13 and watching movies. first i thought it might be graphic card issue, so i deleted the game however it still cause BSOD while watching movies. there is no specific times. it happens within 30 minutes or an hour.
my pc specification are:
cpu: Amd phenom 2 X2 550 BE .
MOBO: gigabyte GA-78LMT-USB3
Ram: transcend 2gb DDR3 1333mhz
GRaphic card: nvidia geforce 9500gt 1GB(however its not working, as it s not been detected in device manager nor able to install the drivers)
INbuild grpahic card: ATI AMD 760G

I did a windows memeory test as well as memtest86 v4.20. and no error was detected till the test passed for 8 times. ANd i checked the dump files in bluescreen viewer its says :

ntoskrnl.exe and gdrv.sys.

I also did a hard-disk checking..no error has been detected.

here are the zip files uploaded using SF Diagnostic tool:
Attachment 239295

I really need help as its not been a month i replaced my mobo.
....sorry for the long post...i just wanted to describe everything.
Please help.

Post it following the Blue Screen of Death (BSOD) Posting Instructions.

Attachment 239302

Attach it again, in your next post.