You still have the device set to activate onboot ??
click the "sweeping Radar" and choose from the drop down list "Other Network"
You should get a window asking for the Name of the network. Type in the name.
Next you should see a check box that indicates whether WEP encryption is being used. If you have to enter a WEP key with the wireless-tools Ex. (iwconfig eth1 essid <nameofnetwork> key <secretkey>) then click the check box, choose the type of key usually hex type and enter your key. click enter and it should work.
IF this doesn't work, Reboot and try 1 more time if fails, set you router to no security just a network name , save the router settings were doing this to first get connected, gotta crawl before you can walk
) then open the terminal
type iwlist scan
Do you see your AP (Router)?
iwconfig ethX essid <name of your network> (without < >)
Type iwconfig -a
Do you have a IP Address?
post any terminal command outputs if you can't get connected.