HELLO EVERYONE!

I am very frustrated with guiminer because all it picks up is my cpu (intel core 2 duo 3.16ghz) which barely gets a 1.5mhash/s....

I am using windows xp 32 bit and i have a ati radeon hd 5770 id like to mine bitcoins with it....

How can i get guiminer to recognize my GPU!?!?!?

Some please help and make me a happy person


-Jayrat