Can i change the video card of a HP Pavilion a6120n Desktop PC?

Thing is that I'm thinking to buy a HP Pavilion a6120n Desktop PC and wanna change its video card in the future. But i cant find the info. on its motherboard. Can someone plz tell me if i can replace in the future its integrated video card with a nVidia geforce 8600GT-DDR3. An extra info. of the computer was the chipset:Intel® 945G Express Chipset.|||Here's a page from HP.com. List's your mobo as a Asus P5LP-LE. http://h10025.www1.hp.com/ewfrf/wc/docum…