i assume you have another pc... and you dont have the drivers disk.
right click on my computer and click properties, then go to hardware at the top and then device manager. if you have any that require attention you need to get drivers for them from another source, so use a floppy or a flash drive to copy the downloaded drivers across... if you dont know how to do this, google for 'Asus p5w dh deluxe ethernet drivers'. let us know how you get on