I have cable internet but can't get online HELP!!!!!!!

I just got a cable modem that is made to run more then
one PC but my home PC does not connect to the internet
but the PC does read that the modem is there and enabled
but pages still come up PAGE CANNOT BE DISPLAYED
Plzzzzzzzzz HELP!!!!!!!!!!!!!


thank you
Upperman Jacob SPC U.S. ARMY