if you have a computer manufacturers machine (dell, HP, etc) get it from their website
if custom built and ethernet built into motherboard, get it from motherboard makers website.
if PCI card (like SMC, DLink, etc) remove card to get identifying make and numbers and get them from their website.
also if you did a clean install you may need other drivers such as chipset driver for your motherboard.
Edited by caperdog, 31 May 2010 - 08:29 PM.