Ok, I have a problem that seems to be getting bigger. Today (5th Dec 2009) i went to play Counter Strike Source on my pc, got a blue screen, and now it keeps Bsod every time i start my computer? I cant even get into the login part without getting Blue Screened? its coming up with win32k.sys and then a whole heap of 1's and 0's and X's...hopefully i can get some help

My Computer
System One
-
- Manufacturer/Model
- Gigabyte
- CPU
- AMD Athlon(tm) 64 X2 Dual Core Processor 6400+ 3.20 GHz
- Motherboard
- ASUS Gigabyte S
- Memory
- 3.5Gb
- Graphics card(s)
- Nvidia GeForce 9600Gt 512mb
- Sound Card
- Realtek high Definition
- Monitor(s) Displays
- VeiwSonic 22" LCD
- Screen Resolution
- 1024 by 768 pixels
- Hard Drives
- 320Gb
- Mouse
- Logitec
- Keyboard
- Logitec
- Internet Speed
- 1.5mbs