how are you connected to the router? wired or wireless
Disconnect the router from the modem. Can you then get to the login page?
What IP does your computer get when connected to the router?
When using the same cable are you able to access the internet and is it just the routers log in page that you can't ? When entering the 192.168.1.1 are you clearing the address bar completely ? Even the http ? If your trying to enter the 192.168.1.1 and the address bar has https:// then it won't work , the s after the p is stopping the proess.