hmm you know, some wireless lans are crypted, is it your router that you connect to or like your neighbours?
If ifs your own then well, try find out if you have a wepkey on it!
And well, WIN ME aint that network friendly anyway...
And just a conclusion since you can see the 3 networks and cant get an ip and connect then I think its the wepkey that your missing, got a wlan myself, and well wepkey is the problem to most things!