Make sure that you are putting the "http://" in front of the IP address. I've had quirky problems like that before. If that still doesn't work, you can easily find the IP of the router. Assuming you're using either WinXP or Win2k, from a command prompt, type ipconfig. The default gateway listed should be the address of the router. If you still can't login to the router, you'll need to reset it to the default settings. After you hard reset your router (hold down the reset button for 30 seconds with the power on), you should be able to get back in. The default IP address is 192.168.1.1 and the default user name AND password are admin. Once you are able to login, change the password, change any other settings you need to function properly, and have at it. Good luck.