Asus laptop vga driver problem

Hello,
I have a problem with my Asus Laptop. The model is K52N. The VGA driver was not installed properly. Last night, I reinstalled its operating system with Windows 7 32 bit. Then I installed the VGA driver from the DVD which came with that laptop. After installing the driver, I played a video from my drive. I have observed that it was not clear and quite pixilated. I reinstalled the Graphics driver, but got no result. Please help me guys.
