How do I recover all the network drivers when re-installing Windows XP?

I got hit wit a virus the other day, and it got thru my virus software. Eventually, I decided to re-install XP. I had rebuilt this system about a year ago, successfully. This time, however, when I re-installed the operating system, the drivers for the network components, such as the either net controller, did not correctly re-install. I have tried to install them on their own, but with no success. I even uninstalled the eithernet controller, then rebooted to force installation, but the wizard will not find the driver on the install cd. I have tried recovering using backups I have taken, but the restore application says that the backup has unrecognizable data(?).