Setting won't stay set

I am connecting a new laptop to an existing wireless network. All the computers on the network are working properly. The new computer refuses to connect when started up, but after going into the properties box for the wireless connection and checking the box "use windows to configure my wireless network settings" then the network is found and all is well. But every time I turn off and restart the computer it will not find the network until I go back into properties and check that box again. The check box refuses to stay checked.

Running windows XP Pro.

Any ideas why this box won't remain checked??