Problem with laptops on a wireless network

I have just set up a Linksys wireless A+G network in my house and a repeater to reach the entire house. I set up the router and repeater with one laptop and all works great. All of the other laptops work great as well until I disconnect from the network the original laptop I used to setup the router and repeater. No other connections work when the original laptop is disconnected from the network - but when I reconnect the original laptop, all of the other laptops connect again to the network and work perfectly.

I set up WEP encryption and matched the router to the repeater. I did not enable any MAC address filtering either.

Why wont the other laptops connect without the first????