How to set up a network connection on a newly installed windows computer?

I have a windows XP Professional computer that I just reinstalled windows in, i deleted everything using DBAN, now I'm trying to get my network connection back. I was wondering how do i do that. The little image on the bottom right hand corner where the clock is that has to the 2 computer with a red X symbolizing no internet connection isn't even there. Just Windows Messenger.








So if anyone can help me out i would be very thankful.How to set up a network connection on a newly installed windows computer?
First,get internet from your phone or cable company