Ah... :S I don't know much about these codes, but you could go into bios and check that AGP acceleration is enabled. It should be somewhere in the menus, or it looks a bit like that (I wouldn't know unless I ran a restart). I'm sure you can find it though
That might be something to do with it, though wouldn't you expect it to not see the vid card at all if it saw it as PCI? :s....
EDIT: There might also be a section to select the bus speed. If yuor motherboard is a 8x accerlaterion AGP, and your card is but its selected 2X or 4X, you'll get less performance.
I'm learning too, see? hehe. We'll get it sorted