Sceptical as I was, Evo, you turned out to be right! After a little messing about with installing the required services and such like it started working like a dream.
After I got it initially setup I set about sorting out WEP encryption and generally securing it.
It was a bit of a pain with the WinXP built in stuff so I took to using the external wireless LAN utility that came with the card, it's all working as it should now.
Cheers,
ASI