Is your Card in PCI mode? You can check this on the active Desktop/Customize my desktop/settings/advanced.
If your settings say "Bus: PCI mode" then you need to install your motherboard AGP drivers.
This is what mine said and this was installed by 'proffesionals' at a computer shop. I wonder what they thought the point of an Fx 5600 if its not running AGP mode!
Heres how it should look (depending on what speed bus you have)
