select Wireless> Security>WPA> under authentication select Pre Shared Key> then type in a pre shared key of your choice (between 8 and 63 characters) eg jaffer01 then> save settings
when you next try to connect to the network you will be asked to type in this key
job's a good 'un
-------------------- XP Home
Office Pro + FrontPage, IE6
AVG, Zone Alarm
Just to check if it is unsecured, double click on the Wireless Icon on your sons machine. Select 'View wireless networks' and you should get a window something like this:>>>> This
If there isn't a padlock with the wording 'Security-enabled wireless network' next to it, it has no protection. However if it has your son knows the key. The System will remember this every time it is started and he won't have to input the key again. This might give the impression of not needing a key in the first place.