Uninstalled Teredo Tunneling Pseudo interface

Hi there!

Following poor internet advice to fix another problem, i uninstalled the Teredo Tunneling pseudo interface and I cannot install it back. I have looked to see if it is hidden and I have tried the copy-pasted directions to change the registry and still it is gone. I had believed it was the cause for my connection to my router, but no internet.. however, I seem to just have made it worse. My external will no longer connect in order to put any files from my working laptop onto the problematic one.

Any suggestions?

Thanks!