you need to change the order to which available network Windows connects. Look in the network properties page of the wireless connection.
My friend's computer can pick up on my wireless network connection as well as another wireless connection here. It worked for a few weeks fine, but now all of a sudden it has just stopped working. It will show up and the signal strength is good, but when I try and connect, it says it's connected to the other connection that it is detecting, but she doesn't have the password for that one, and the internet does not work. She has XP with service pack 2. I tried taking SP2 off of there thinking maybe there was a conflict there, but that didn't help. I have WEP enabled so no one else can use my internet. Any suggestions would be greatly appreciated Thanks.