Hi, your WEP key would be in your router. Login to your router's setup and it will be somewhere in there. If you can't find how to login to your router, go to Start > Run type "cmd". In command window, type "ipconfig". Next to Default Gateway will be an IP address, in your browser go to
http://THATNUMBER. If you post your make and model of your router, I will try to get you and exact way to find it without having to search.
Regards,
Adam