Welcome to the Seven Forums.
So - you have a LAN cable (wire) going from your computer to your router, correct? Look at the place where the wire connects to the computer and let me know if you see a little green or orange light.
Also let me know if you see the network adapter via these screens
Start > Control Panel > View network status and tasks
(or Network and Sharing Center
In the upper left corner of that last screen
, select the link named "Change adapter settings".
Do you see any adapters on that screen? If not, then you might need a driver
so that Windows can make use of the network adapter... but we will deal with that after you let me know about the two things above.