When you type that number in, it asks for a username and password, or displays nothing?
If you're connected to your router's wireless signal, then click start->run, and then type 'cmd'. press enter. then in the black dos prompt, type 'ipconfig /all'. note what it gives for your gateway.
hopefully it's 192.168.1.1 (it doesn't have to be)
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if you get the admin and password box, but it won't let you in with your password, first check that you're typing it in correctly, and if you are, then reset the router and set it up again. this can be done with a paperclip in a small hole on the router, and then using the default password (see here)
http://www.routerpasswords.com/index.asp