We recently moved and set up the computer. I have

Not sure if you still have your setup instructions (download them from the manufacturer - its usually a pdf file)

On your router if you look closely there is a very small hole in the case sometimes with the word "Reset". Insert a paper clip and gently push for about 30 seconds. This sets your router back to the factory defaults when you first purchased it.
You will need to know your URL (from your instructions) and default usernames and passwords.
Remember, once you access the routers configuration page to change the codes (and remembe them).

Hope this helps.

Moving means that you have to setup the router again. The WEP key has to be setup again. Your old settings were for old location. Could be same settings, but they have to be setup again.