Hp Laptop Video card Problems?

I have a Hp Zv5466Cl I just bought used. When I turn it on, the bios information comes up Tiny in multiplied 5 times on the screen. The windows Xp logo comes up fine but it comes up as if there no to video driver installed. After the point (when the video card is installed) the screen flickers a little bit and goes blank. When the video card is not enabled, Windows starts up normally but it is blurry and unclear like it should be without a driver. When I enable the driver while Windows is operating, It does not get sharper and clearer. Random pixels on the screen go Blank. Please help me understand this problem?|||This is why you never buy used from people you don't trust.