Before I get your hopes up... well, just don't
. I, too, have had problems in XP. For the first few months I had XP installed via bootcamp on my iMac, my wireless worked fine! Then for some odd reason, it just stopped working. I hadn't downloaded anything, changed anything, updated anything... Nothing! For the next month I had to use the internet via ethernet because I could not figure it out...
I came across a few threads on the Apple forums, but never could figure out. I tried changing the security of the wireless network, such as from WEP to WPA to WEP2, to unprotected etc, but nothing worked at all. Eventually it just started to work again... totally random. Then after a month or so it stopped working. After that, I ran across another thread telling me to lower the encryption. I changed the network to a less protected version of WEP, I think I changed it from 128bit to 64bit encryption... and now it works from that. I would just mess with that... Seemed to work for me.
Hope you can figure it out! Windows can be such a pain in the arse.