Serious advice, not just poking. There is nothing you want from that P3 2.8. Start from scratch with a new build. Give the old machine away, sell it, whatever. (Unless you really like the case/psu).
Post over in the new build forum saying you want an AMD build and give the price range. Fill in the sheet they give you to explain how the system will be used (so they don't build a noisy gaming system for a home theater user or visa versa).