Yeah try drivers, but it could also be the graphics card failing since it is old (though this probably isn't the issue).
It could be the same you see as ATI cards where if it fails, it starts an auto recovery which would bring up that message, and might cause some issues like that if it didn't recover exactly well... so yeah, again, could be drivers like people have already mentioned.
The motherboard i doubt would have been damaged by the way when the newer burned out card though, so dont worry. I doubt it died in the way of smoke and melting on the motherboard, etc, hehe.
Could the card by any chance be booting to vga drivers used in windows safe mode when the error comes up?
(If this is the case, you probably dont have Windows XP since I'd guess th resolution and colours would be more than 16 like what happens in older windows in vga mode)
So go into your display properties by right clicking and going to Properties followed by the Settings tab and check when it crashes that it is still saying the card a default monitor and not default drivers for example
I hope this helps