|We set this up three years ago|
Set what up?
we need to know the password or code for wireless connection for our laptops.
Did you change something in your network and now the laptops can't connect and they could before, or, are these new laptops you're adding to your network?
Guessing that the "what" from above is a wireless SOHO Router (would still be nice to know the make/model)..............
If you can connect to the management interface of the router through your web browser, you can look up the SSID and encryption key.