I got a Dell Inspiron 1501 (one of the AMD based models, circa June 2007) that I reinstalled Windows on, and now have wireless connection issues.
The rundown, I installed a fresh copy of Windows XP Pro with SP3, and downloaded all of the drivers that Dell recommended based on the service tag, then ran Windows Update and brought everything up to date. Wired networking works fine (and is how I ran Windows Update).
When I try to use the Windows wireless tool, it will display the network, and allow you to connect to it (either prompting for the key or reminding you that the network is insecure). Once it starts connecting, the wireless tool says "scanning for networks" for a few seconds, then comes back with "no networks found" and will not redisplay the network you tried connecting to.
The wireless card is a BCM4311, and the routers I've been connecting to are varying models of Linksys (a WRT54GLv1.1 with OpenWRT with no encryption, a newer N band Linksys with WPA-PSK2, and an older access point only model with no encryption). Other devices can connect to all three networks fine.
There are no entries in the event logs about this that I can find.
I am really stumped and more then happy to edit the question with any additional information anyone wants.