I had similar problems with a Dell PC that had an Intel 810 graphic controler. Updated the video driver and everything was great. Did you get this before SP1 or just since you loaded it?
I didn't used to get it prior to SP1, however, I'm on a new machine now, and have installed SP1 as part of the setup of it.
Ahh.. I just checked my Device Manager - I have an Intel 810 too...
The penny drops..
I'll update the driver too, and hopefully that will fix it.
Thanks for the tip.