Why can't I play blu ray DVD's with my BRAND NEW Computer?

I just bought a refurbished Gateway computer with a 9600 Quad core processor and a ATI Radeon HD 2400XT graphics card. It has a built in blu ray player. I'm attempting to play my first blu ray disc (with Cyberlink Powerdvd) and the disc plays for a second and then an error message comes up and says that my graphics card driver is incompatible and I need to get a better one. Well, I downloaded Catalyst Software Suite (32 bit) English Only v.8.4 (with driver) and I still get the error message. Do I need to 'activate' the driver or something? How do I do that? WHY CAN'T I PLAY BLU RAY DISCS...THIS IS REALLY FRUSTRUATING! Thanks!!!!

PS: I have Vista Premium
 
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