1. If the ethernet card is not failing on your computer, which it probably is, try visiting the Realtek site and see if they've got an updated ethernet driver for your card.. (By the way, checking Device Manager to determine if the driver is up to date means nothing.. It only checks the computer and possibly a few online locations, but it doesn't check all sites for updated drivers..)

http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=14&PFid=6&Level=5&Conn=4&DownTypeID=3&GetDown=false

2. If an updated driver from Realtek doesn't get it done, then we purchase an inexpensive USB ethernet adapter which plugs into a USB port and after disabling the original ethernet card, it will work just fine.

Hope this helps.

Grif