I used to use a wireless network adapter, but I bought an ethernet cable. I attached it to the router, and plugged the other end into my pc, but nothing happens. I looked and my motherboard info says "Modem/LAN: No/Yes", so I went on my mobo disk to the LAN folder, and installed the driver. I don't see the driver in Device Manager, so I don't know if it installed or it doesn't show, but again, no wired connection. How do I set up the connection?

Since its not showing at all in device manager it may be disabled:
Check your manual for setting the BIOS to enable on board LAN.

You could also try right clicking on "Network Connections" on the desktop and selecting properties. Your LAN adapter should show up there if the drivers are installed for it. If you are logged in under an administrative account, you can right click the LAN adapter and select enable.

Ah it turns out I had it turned off in my BIOS, so I turned it back on, and then I was good to go. How embarrassing haha...

Thanks for all the help!

No problem, glad you got it fixed!