I just came up to Connecticut to visit my girlfriend's dad, who lives with her brother.
Her brother has a network set up using an Airport Base, her dad has two laptops: one XP machine and one Vista machine. The Vista machine picks up the wireless just fine, however the XP machine which apparently had connected wirelessly before hasn't do ne so for some time. I've tried a few things, the Airport is broadcasting on channel 2, so that should be fine. I tried downloading the WPA2 Hotfix for XP, but it said the something about the Service Pack and that the update was unnecessary. I also tried downloading a new wireless driver for his internal wireless device. (Which is an Atheros AR5004G) If there's any extra information I can provide, feel free to ask. I just want to get him running wireless before I go back next week. haha I'm going to keep cracking at it, any help is appreciated though. Thanks!
I think I figured out that the problem is his wireless card doesn't have the proper encryption. I need to get it to WPA2-PSK encryption, but I can't find an update on Atheros or anything to make the card capable of that kind of encryption. Does anyone have experience with Atheros and know where I can get an update for AR5004G card to get WPA2-PSK??
My end result was that his wireless card was just too old and there were no available drivers to make it handle that sort of encryption. He had to purchase a new wireless card and then it worked fine. So that may be your problem.
I would however check which channel the AEBS is broadcasting on as well.