Question Author
Thank you all for your answers so far, I will pass them on to my grandson.
markysngc your answer seems to make sense, regarding the WEP and WPA-PSK encryption key.
How does he enter these, so as to try both along with my Network key?
ACtheTROLL
My router is wired up to my main computer operating on XP, and my laptop is wireless operating on Vista and these are both secure and work fine. My grandson's laptop is also wireless operating on Vista, but this is the one that won't connect to my network.