Error 43 code with display adapters

Hi

I've owned a DELL XPS m1730 since last September.  Its specifications are:

Intel Core 2 Extreme CPU X9000 @ 2.8Ghz

4GB RAM

Geforce 8800M GTX in SLI

Vista 32-bit

A couple of days ago i was playing Unreal Tournament.  This was one of the main reasons i bought the XPS as i had seen that this laptop played the game flawlessly.  2 days while playing UT3, in mid-game suddenly the game started to slowup.  Moments later the screen went to a blue screen - from memory i can't remember exactly what was said on the screen as it went by too quick.  After a few seconds passed it restarted automatically.  When it logged back on, i realised that Aero theme was disabled.  So ii tried enabling it, but the option wasnt there.

I check in device manager and realised that there was yellow (!) near the garphics cards.  It read "Windows has stopped this device because it has reported problems. (Code 43)".  So i thought it was driver issues.  I then updated my driver with at least 5 different versions from Nvidias site, although nothing helped (and yes i uninstalled driver the properr way with driver sweeper etc).  In device manager when i try to click "Check for solution", normally it would check, but this time round it says "could nto laod driverr software".  When i run dxdiag i and check the driver it doesnt say anything under there, although when i check in device manager it says the updated version that i put on.

So i'm wondering if anyone here has any insight as to what could be the problem and what i should do.  I've also backed up all my files and restored the laptop to Dell Factory settings, and still the problem persists.

Any help would be appreciated

Peter