Can you be a little more specific about how the computers are connected and configured? I'm a little confused by "One computer is connected to the internet but the other is connected to the router but the internet cannot be found."
Also, you might open up a cmd prompt (start / run / cmd) and then run IPCONIFIG /ALL. Both computers should have identical information except for the last digits in the actual IP address.
Also, you might open up a cmd prompt (start / run / cmd) and then run IPCONIFIG /ALL. Both computers should have identical information except for the last digits in the actual IP address.