It's agp, did the video card die, is that why you want a new one? It has integrated that you can use. It's a really old pc, may be time to retire it. But bit is irrelevant, it can be whatever, it has nothing to do with os bit. As long as it's agp and doesn't need more power than your psu can provide then it will work. I'd really suggest not upgrading/wasting money on it but you'll need to post what version you have, a budget, and what you use the pc for if you really want a new card.