How do I install my NIC?

Recently when I accidently uninstalled the component root hub for my NIC I lost internet connection on my other computer. WHile this computer since it didn't get uninstalled on here I still have my computer.

Don't tell me to call my manufacturer (dell) since my warrenty is expired.

you'd go to dell's support site, look up your model of computer, and download the networking drivers for your system. Move them to the system that needs them and install.

Simple as that.

open Device Manager, find your NIC then try to re-install it.