Reinstalled windows and now wireless networking not working

I have a latitude 600 and I just reinstalled windows and now the wireless networking is not working. I can connect to the internet if I plug the cable from the modem into the netowrk jack in the computer but thats it. Before, there was a little icon at the bottom that would say "searching for wireless networks" and there was a little green signal thing flashing. After the reinstall, there's nothing there. I click on the start menu, programs, and the dell wireless utility button but nothing happens......i click on it 10 times but still, nothing...............is there something I need to install to get that wireless netowrking icon back so it will search for wireless networks? Thanks so much for all your help.