Are you sure your Modem/Router has a IP of 192.168.1.1?
Perform these steps:
Click Start - Run
type cmd - Click ok
In the Command Window type ipconfig and press enter.
See what you IP address is... If it is 192.168.1.? Then you SHOULD be able to access 192.168.1.1 and in which case I would reset the Defaults to the Modem/Router. And try again. I changed my IP to my Router from 192.168.1.1 to 192.168.10.1 so my IPs show up as 192.168.10.? and in my IPCONFIG command I would have a IP of 192.168.10.2 or something depending on which 1 of 11 Computers/Servers that is on the network.
So if you get a IP in IPCONFIG of 192.168.2.? then try to access the Modem/Router with the IP address of 192.168.2.1