I am not understanding this.

I am assuming that you are speaking of the wireless adapter that goes with the router that is not compatible? But how do you know that? ( Couldn't find anything on that mobo, is it a D865 perl ? )
Just because you could not get it to work?

Did you try the card in another computer?

Did you try it in other PCI slots on that computer?

Many motherboards share one PCI slot with the AGP slot, so you can't use both at the same time ( usually it is the PCI slot next to the AGP slot. )

When it was installed did you check System Information ( Start\Programs\Accesories\System Tools\System Information, or just run msinfo32 )
Look under Hardware Resources ( looking for Conflicts\Sharing and Forced Hardware ) and Components ( looking for Problem Devices )