Missing Network Driver on Newly Installed Windows 7

Hello, I just obtained a dell inspiron zino HD computer which was already running windows 7. The initial hardware was already running windows 7 but the previous owner had children that downloaded a lot of games and accumulated a lot of viruses. Im cheap so instead of paying for virus-ware i ran the windows 7 re-installation to my hard drive (which i have done before). Now though, the network, and im assuming the rest of the drivers have not been installed and I'm running windows 7 base programming. im at a loss as where to go because the drivers disk that came with it requires internet to operate the setup wizard. The message says my network addaptar doesn't have a driver to run the program and the straight connect from the modem will not load either. my router also came with an instillation disk but will not run unless its connected. I tried downloading all the drivers straight from dell off another computer, but non of them could be recognized. I need help!!!!!!!!