Internet not working after putting in a graphics card?

I put a graphics card into my computer because WoW and Minecraft have been running terribly for months. The graphics card was previously in the computer probably about 8+ months ago but for whatever silly reason my dad took the graphics card out. It was working fine.

I'm not very tech savvy but I know how to put in a graphics card, so I put it in (there was previously no graphics card) and when I started my computer, the internet wasn't working. Still isn't.

This is the graphics card http://www.newegg.com/...6814162115
I don't have any of the stuff that came with the card because we got it like 2 years ago.

I troubleshooted the connection problem and this is what it's telling me:
The Intel(R) 82578DC Gigabit Network Connection adapter is experiencing driver- or hardware-related problems.

It doesn't give any solutions. I tried taking the graphics card out and running the computer like I had been before, but the same problem occurred. I don't believe I knocked anything loose while putting the graphics card in. Please help!

And please use simple terms and give easy to understand directions if you're able to help, I don't understand most of the computer terms.

It's prety common, most of the people just pull out the lan card a bit while placing the gpu, it looks like it is in but it's a bit out. Put back the gpu and then press the lan card inside the board tightning it again into the mother board, then place back the lan cable or ethernet cable and try to run it, it'll work.

Likely you just have a driver conflict, which is why your dad took it out in the first place. This is a sign of an awful motherboard, but no matter, this problem can be solved for $14 by buying a usb wlan adapter. Either that or you can try to get newer drivers for your ethernet adapter on your motherboard via another computer, and transfer it over via usb stick. Here is the driver link:

https://downloadcenter.intel.com/SearchResult.aspx?lang=eng&ProductFamily=Ethernet+Components&ProductLine=Ethernet+Controllers&ProductProduct=Intel%C2%AE+82576+Gigabit+Ethernet+Controller