Blue screen atikmdag vista 64

I've been getting this error on my Toshiba Satellite laptop:

"Display Driver Stopped Responding And Has Recovered. Display Driver Atikmdag Stopped Responding And Has Successfully Recovered."

Started about a week or so ago as I have been using a monitor via the VGA connection for a dual-view setup. The screen will go black, then comes back on, then goes black (flickers like that 3-4 times) and then goes to a blue screen and shuts down.

I'm using Windows Vista 64 Home Premium, SP1. I haven't been able to find a Vista 64 SP2 or later.
Any suggestions would be greatly appreciated as Toshiba's tech support is USELESS!! Two LONG conversations with them and no remedy, they have no idea how to fix it or what to suggest.

Thanks.

Greeting: Some useful hint for you here

Display Driver atikmdag Stopped Responding

http://www.repairyourpcnow.com/res [...] onding.php



Display Driver atikmdag Stopped Responding

http://laptopforums.toshiba.com/t5 [...] g/m-p/6146



ATIKMDAG stopped responding has recovered

http://www.tomshardware.com/forum/ [...] -recovered

Good luck..

the vista aero uses your graphics card sometimes to render the opening and closing of your 'windows', and your graphics card just crashes. On my laptop its also like this, switching to classic stops the problem, but then if you use 3D software like CADD or 3D games, or watch DVDs that involves hardware acceleration then it might crash the way before switching classic does.