Its a piece of pish - get it sorted
Start - Run type "CMD" and press enter key
make a note of gateway IP address.
open up web browser
type http://{the ip address as you recorded it} in the address bar, then press enter
you should now be at your routers configuration page
select Wireless or Wireless Security
Enable encryption - choose WPA (don't ask why just do it)
Give it a passphrase - (something you will remember)
Apply or Save Settings
Once this is done child's laptop will lose the wi-fi connection, fine just view available wireless connections, find yours (it will now have a padlock next to it)
Select & connect
It will prompt for passphrase, put it in confirm and voila on-line again.
Repeat for Wii (even easier from memory)
Job done, now be a bit more discreet in your recreational browsing as you have no excuse now