Try updating your drivers as LadyCrimson already said.
I had the same problems yesterday with my Radeon Mobile 9700.
Luckily ATI finally offers drivers for their Notebook CPUs ... so after a driver update everything works fine now...
Well... just the videos, when called ingame, are shown too small in the upper left corner of my Windows Desktop now ....
The other possibility to somewhat solve the problem would be to deactivate the videos completely in the setup menu ... but that would be the last option for me
