Game Freezes And wont respond only when firing any weapon

[Scatterbrain 0]

So yeah, been trying to iron out this issue for a few days now and nothing i tried have worked, the game freezes and the process cant be shut down, even if i log out of windows and log back in again the process still persists.
so everytime i have to to a hard reset of my computer which is (by slight understatement) a bit of a right pain in the arse. ive tried:
running it in a window
disabling Vsync, postprocessing , AA and all those fancy things
uninstalling and reinstalling
clean installing my video drivers
force disabling vsync, aa , yadda yadda in nvidia control panel

and im now at mu wits end, any help or suggestions would be greatly appreciated.

[TedZ 424]

Whats your specs

[Scatterbrain 0]

Operating System: Windows 7 Ultimate 64-bit
BIOS: BIOS Date: 04/29/09 10:58:25 Ver: 08.00.14
Processor: Intel® Core2 Quad CPU    Q9400  @ 2.66GHz (4 CPUs), ~2.7GHz
Memory: 4096MB RAM
DirectX Version: DirectX 11
DWM DPI Scaling: Disabled
Card name: NVIDIA GeForce GTX 560 Ti

If thats enough ?