replacing ethernet card

[Alchemist]

I'm assuming my Ethernet card needs replaced. The other day my computer was unable to see an internet connection or my wife's computer on the LAN. However hers was working ok. Could this be a result of any other problem? I checked all the physical cable connections and they were ok.

So I did a short search on newegg.com for a new ethernet card. I'm not all that technically savvy so I don't really know what specs I need. Are the basically all the same?