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.