Connecting computer

ok i figured out how to set up the home network and transferred all the files over. New problem, is that the new computer can’t find my internet connection. It finds the ethernet card fine, but it can’t find the connection. Whenever i run the comcast install disc it says “cannot find your internet connection” but as soon as i unplug it from the new computer and plug it into the old computer (one i’m typing on right now) it connects to the internet no problem.