Macbook pro can't find preferred wireless network

Question

My father signed onto my wireless network using his own laptop (PC) with my passkey.  Then after he had been on I tried to connect to the internet with my macbook (and iPhone) and my network was gone.  If I look at the list of available networks it lists my neighbor's (which usually doesn't happen) and the name of my father's computer but ours is gone.  If I go to my preferred networks, I see mine listed but then when I try and connect to it is says it cannot be found.  I tried creating it again but then when I enter the password it says it's invalid.  I tried connecting to the network under my dad's computer's name to see if somehow the name changed on its own but it says invalid password as well.  Any ideas? 

Answer 1

"If I look at the list of available networks it lists my neighbor's (which usually doesn't happen) and the name of my father's computer but ours is gone."
Your father's computer should not be showing up in the list of networks unless he mucked around with your router. Log in to your router's admin pages and see what the issues are.