I have a dual boot laptop Dell Inspiron 1501
my wireless router is broadcasting on channel 13 (this is legal in UK, and is a good way to avoid interference with dozen of other networks in a neighbourhood)
Ubuntu is able to see my network and happily connects to it. Windows 7 is not seeing my network, not even after i changed my location in Control Panel to UK.
my other Windows xp laptop - is able to connect to wireless no problem.
please do not suggest to switch the channel.