On trying to conect my son's tower to the

This usually means you are to far away from your wireless router for the computers adapter to work. Things you can try:

reposition your router. Is there metal or concrete between it and the computer?

avoid having other 2.4 Ghz wireless items nearby. I have seen a X10 camera block a laptop from getting a connection.

replace the adapter on the tower with a usb type with a cord. This allows you to place the adapter in a better position to receive.

switch to a hardwired connection (cat5 cable) or change your wireless hardware to type N.