Well I can share somethings that I ran into with DLINK, CISCO, and 3COM wireless cards.
1) 3com cards would let me reconfigure them, by reinstalling them (laptop models), what I mean is by pulling them out and then pushing them back in.
2) Alot of the settings can be configured through Device Manager for the particular card. Including SSID, Speed, WEP keys, Etc.
3) You logged in as an admin right?
4) Uninstall and reinstall the device? Latest Drivers?
5) Is it just you or are another wireless devices having problems accessing the WAP?