Ok, so everything was normal, and then my friend came over with his laptop. He connected to my network, but needed my router pin to do so. We entered it in, he connected and then WABAM! My ssid changed to his home ssid, and my security and wep key became his home settings. Does anyone know how to fix this? If you need more info ask in the answers part.

there are so many ways..
but im tired so the sure way is restoring your computer the day before you did it.
You’ll need to log into your router and change it to whatever you like, just like you did when you setup the router the very first time.