IP problem?

I have a Dell computer that for some reason some time ago, consistently fails
to connect with the internet, even though it is connected directly to the
cable modem. I used to have it in my home network and it was connected to the
only printer I used, which worked fine on all machines in the network, and
THEY all connected to the internet just fine. The only problem is the Dell
and I have done just about everything I can think of, so I am coming to the
community for help.

Hurry. The snow has come to our hillside!
--
Michael in Anchorage