You may secure your wireless network thru your router's setting by following this Tutorial
. Please use the highest network encryption which is WPA2, make sure that you apply the same security setting to all your wireless devices in your network with the proper pass-phrase.
If for some reason, you're having a hard time connecting your wireless computers to your Belkin router, please follow this Article
on how to manually connect to your SSID (wireless network name).
An update will be nice.