I just got a PC from my parents. They used it. I want to erase the hard drives there are two and reinstall windows xp. How do I go about doing this? Will I need the cd for video cards etc?

Is video card on board or separate, if on board then windows xp full version should pick it up most of the time

It is an onboard. I am going to replace with a new separate card if possible and install a new sound card.