Vista internet problems

Hi, I have a vista laptop by gateway and I have too problems

1. When I am trying to connect to my router I have to enter in a user name password and login in domain, I know the password, but I am unaware of what I have to put in the login domain, and username.

2ndly After this I am running IE7 and no matter what I run on it tells me internet explorer can not display the webpage.

I am trying to figure out what I must do and I can't work it out.

Please respond as quickly as possible