Thanks guys for your replies. I have been talking to HP help center and they said that if I want to upgrade then I have to replace the mobo, the video card is built into the mobo.
lso I have been looking on the net for mobo's but they are pretty exp. so I think I will go back to XP.
gain thanks for your help.
You didn't answer if it was a laptop or not. If you're not very familiar with this type of stuff, I would not suggest trying to replace a motherboard on a laptop - it's not easy.