If you have the extra funds, it is probably better to just build a new system, but you could easily salvage your floppy, cd-rom and hard drives. Otherwise you could just get a replacement motherboard that uses the same type of ram and supports a p3. If you would like an exact replacement, check ebay!
IWill XP-333 / 384MB PC2100 DDR / AMD T-Bird 1.33GHz (o/c to 1.40 until I get a better CPU cooler!) / VisionTek GeForce4 MX440 / SB Live! X-Gamer 5.1 / Maxtor 20GB 7200 RPM HD / Toshiba 8X DVD / Sanyo 40/12/40X CD-RW / Win XP Home