Then it might be the wrong one. Press your Windows key and R together then in box that appears, type
cmd /k ipconfig /all
exactly as I have, including the spaces, then press the Enter key. A black form shows up and the address you need is in the list as the Default Gateway.
If it is 192.168.1.1 there must be a fault with the router if it won't even display the login page. If it does, try admin as the name and cisco as the password - that sometimes works in Linksys routers.