Are you typing in just the 192.168.1.1 in the address bar of the web browser ? Are you sure that those numbers are the correct numbers ? There are some brands that use a different number like 192.168.0.1 , it's rare but in either your user manual or on the bottom or side of the router you should see that set of numbers. It is also better to use just those numbers and not include the http because if there is a s (https) then it won't work.
 


The proper way to find out the correct IP address is to connect your router to the computer with the cable that came with the router then go Start then Run in XP - Windows key plus R in Vista and Windows 7 - then type in the following, including all the spaces:-

cmd /k ipconfig /all

then press Enter and from the black form that shows up, take a note of the numeric code beside the Default Gateway icon - something like 192.168.0.1.

Type exit to close the black form.

Open Internet Explorer and enter that code into the URL address bar as though it was a website. You're then at the login page to the router's settings utility and admin will usually be the login with either admin or password as the password.