Graphics card and wireless card problems?!!?!??!?

Hi All

ive just bought a (second hand) graphics card (NVIDIA 5200FX)

and about a month ago i bought a ASUS WL-138G V2 wireless lan card.

ive had the wireless card working great for the past month in the pci slot.
I was sick of onboard graphics. so yesterday i put in my recentley bought graphics card (AGP).
i started up the computer and was amazed with what the graphics card had done with my screen. so the first thing i did was try going on the internet, but soon relized that my wireless card wasnt picking up my modem.
i tryed installing the drivers again but that didnt help. soon enough i was taking out my graphics card and testing my internet connection. and to my suprise it was working fine (using onboard graphics). so i put my graphics card back in to see if it had somehow fixed itself, but got the same results.

please someone tell me what i have done wrong.

and im running Windows XP

Cheers

check device manager for conflicts start->run->devmgmt.msc