You want to use a Virtual Router. Google Virtual Router and see which you want to try.
I have a new computer with a wifi card that I am using to connect to the internet with. I also have an old PC that without a wifi card that I would like to connect to the internet. Is there a way I can connect the two PC's with an ethernet cord and then share new PC's internet to the old PC?
When I select bridge connections on new PC it says that you need two lan connections, so I need a way for lan to wifi.