Not much help, but my 3-com BlueTooth PCMCIA card plugged and played in both W2K and WXP with no problem at all...it just works.
It's also better than other cards because it has no external protrusions (it does have retractable aerial, but you can leave it retracted and it works.)
It was also one of only two things that survived my ditching in the Tay Estuary...the other being a gold tie pin!
W