active devices appear DIMMED

hi there, I have two other pc's on my network and they
are all logged onto the network and have full acess to
the internet. However, they all show as dimmed in the
microsoft broadband utility and i cannot access files on
any of them nor use the printer. I can see that the
other pc's are listed as network devises, but the are not
available for some reason. They are on and not in sleep
mode. Help.
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