try going to your network hardware's properties, and setting it to connect to "Any Available" network.
I have a netbook which is using window XP SP2. When i tried to connect to the available wireless network of my friend i can't connect though I have the network key. Instead, when I click the said available network this message will appear " Windows can't connect to the network or network will be no longer in range" but the signal is full.
Please help me with this problem.
Thank you and God bless :))