cheri, do you have a Motherboard cd with chipset drivers? If so, load it and run the Ethernet driver installation.
No? Then try going to Device Manager [run devmgmt.msc], expand Network Adapters by lclicking the +, then rclick your adapter, choose Properties.
Go to Driver tab, press Roll back driver.
If that does not work, navigate to the same page, but instead press Driver details button. Note the driver names, gurgle for them and dl from a reputable site [you can dl them to a flashdrive etc]. If you require more than one driver file they may all come in a zipped package.
Finally go back to that DM page but press Update driver.... force the wizard [ie. do not go to Windows update site] to look in the folder or drive to where you dl'd them.
It is usually better to create your own thread with a few details, like the mb make, model, ethernet model...

. I mean, I've gone to more trouble than you did.