go to the start menu - click run, type "cmd"
in the black window, type "ipconfig"
it will show you a number like... 192.168.x.x
(x's are numbers)
open a browser (internet explorer or mozilla firefox) - and type in the address bar what you saw up above - except ending in a "1"
so...if its 192.168.0.10 in the black window, you'll type 192.168.0.1
if its 192.168.1.99 then type 192.168.1.1
now, if you have a linksys router, the username/password is [blank] and "admin"
if its anything else, try "admin" and "password"