Cnetdownload.com

on the home page you should see the download software finder under that there will be a list platform, category sub category price from the category drop down list select drivers then from the price drop down list select free or which ever applies to your need click start control panel administrive tools computer management device manager scroll down network adapters + expand Ethernet driver right click you will have options to update driver disable uninstall or select properties general you will have the options to troubleshoot or to update driver rollback or uninstall a yellow? ! question or exclamation mark or red x means you need to install/update driver right click to install driver

http://download.cnet.com/%7Bvalue=http://www.download.com/network-3c905c-txm-ethernet/3000-2112_4-109025.html

hope this helps