Here's a link to your mobo manual (it wasn't easy to track down):
http://www.motherboards.org/files/ma...25/Napoli2.pdf
Looks like you have a Slot 1 PCU, max of a P3 550MHz. You have an AGP slot, most likely a x2/x4. Your mobo can handle a max of 256MB, 168pin RAM only.
You're better off starting from scratch, I'm afraid.