Screen suddenly goes color crazy and machine freezes!

Hi
Had a strange issue recently, the 2nd of such events which basically rendered my computer unusable. Started on Monday after a system update, screen started flashing colors and gradients of gray and then just froze. I reinstalled system software and everything seemed to be ok until about 1/2 hour ago, when it happened again. This time I took pictures and did a screen grab of the apple error report. I'm hoping that I have a software issue rather than a motherboard or other hardware related problem.
Ay advice?
thanks
DJH
I don't seem to be able to upload the error report graphic...

The last event was at 11:50 this morning. Machine froze and took about 3 restarts before it would boot back up without erroring out.
GeForce 8600M GT:
Chipset Model:          GeForce 8600M GT
Type:          Display
Bus:          PCIe
PCIe Lane Width:          x16
VRAM (Total):          512 MB
Vendor:          NVIDIA (0x10de)
Device ID:          0x0407
Revision ID:          0x00a1
ROM Revision:          3212
Displays:
Color LCD:
Resolution:          1920 x 1200
Depth:          32-Bit Color
Core Image:          Hardware Accelerated
Main Display:          Yes
Mirror:          Off
Online:          Yes
Quartz Extreme:          Supported
Built-In:          Yes
Display Connector:
Status:          No Display Connected

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Keywords:
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Keywords:
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