Wireless Stopped Working

On my Dell XPS M1330 with OpenSuse 10.3, the wireless network has always worked fine without a problem, since a couple of days it won't connect to my wireless netwrok anymore, I keeps comming up with the window asking for the WPA code. What could be te problem and is there a way to reset the configuration of the wireless network card because it keeps remembering the WPA code (wich is normally a good thing to have but now I wan't to have it sort of reset)???

The wireless network is ok because other computers don't have the problem on this network.