You don't say whether he's using third-party software provided with the wireless adapter, or Windows' Wireless Zero Configuration to manage the wireless networking.
If not already using "Wireless Zero Configuration", I'd suggest trying it. Go into the Services window ("Start > Run", type SERVICES.MSC and click OK), scroll down to the Wireless Zero Configuration entry and double click it to open its Properties sheet. Make sure the service is "Started" and that its Startup Type is "Automatic".
Now, in the Network Connections folder ("Start > Run", type NCPA.CPL and click OK), right click the Wireless Network Connection and select "View Available Wireless Networks", select the entry for the network he's trying to connect to and click the Connect button.