x800 gt a/w driver probs

im having a lot of problems instaling the gfx card drivers for my x800 gt
the gfx card im pretty sure is working as i got it off a friend where i know for a fact it was working fine

the gfx card is an x800 gt all in wonder which is made by ATI and not another distributor

im not a complete noob when it comes to computers and i have worked as a technician in the past (while ago now though)

the motherboard is the asus A8R-MVP s939 based on the ATi rd480 chipset (or something like that not the rd580 though)
i have just bought the motherboard off a retailer that i know and trust although it was 2nd hand

device manager simply reports it as a video controller and video controller-vga compatable under the part that shows hardware with problems that has the exclamation mark (its been a while lol)

any help would be appreciated thanks

i havent flashed the bios yet and i installed all drivers except the gfx card driver as it wont install

i dont have the disc by the way, but im using the latest and proper driver for that card and winxp

the gfx card isnt asus its ATIs own brand
and i have motherboard drivers installed and .net etc