first off, have you followed the set up on the CD? entering username/pass.. or a WEP key
if you have done what was asked in the set up then only advice i can give is give Orange a call (there costmer servis is not so bad when i last used it)
also might be an idea to check in Network connections to see if the router/wireless adapter is detected, but not connected.. or your computer is not picking up nothing at all. before you give orange a call.
may possibly be a USB hub that is faulty so maybe wire it up again, that's if your using a USB for it.
i don't know, just a few ideas.. someone else will probaly reply later that has a solution for you
good luck