Radeon HD 5670 bsod

Hello

So I bought me a brand new Radeon HD 5670.

I played some games with no problems for several hours.

The one and only thing that happened which caused the bsod, is Southpark. Southparkstudios.com - It played an episode for about 1-3 minutes and blued out, every time I tried.

I used WhoCrashed to find that the cause was in the new driver. I have 2 files matching it by time, and they're ativvaxx.dll & ati3duag.dll

So I checked and double checked and found that my old Nvidia driver was still installed (in Add/Remove programs)

So I removed it.

No change.

So I uninstalled and reinstalled the new (and updated from ATI.com) driver.

No change.

I updated the BIOS.

No change.

I even fiddled with the RAM and the different slots.

No change.

btw, all this wasn't done in this particular order, but I lost track of time and time-consistency. So for me it all happened at once  

So now I'm back at the starting point, with the old drivers definitely removed, and the new one definitely updated.

I still can't watch Southpark.

And if I'm not mistaken, I can watch other stuff.

The one time I didn't get the bsod was when I removed the card, and plugged the screen to my good old on-board video exit.

My specs:

Win XP Pro SP3
Intel core 2 Duo CPU E6550 2.33 GHz
2GB RAM
Intel Desktop Board DG33FB

My power supply marked as 500W maximum capacity, and according to http://extreme.outervision.com/PSUEngine I need less than 300W

Seriously you guys, not cool...

Please help, and don't say "stop watching southpark"