Connectivity / file sharing

I'm running win 2k pro and I'm using the microsoft
broadband network software. I've got 5 PC's connected. 4
thru wireless and 2 hardwired. When i look at the list
of "network devices", three of the five pc's are showing.
In place of the other two is pictured a box. When I click
one of the boxes i get the message "The device you
selected does not provice any information". I've got file
sharing turned on on both of these pc's but for some
reason i can't access the files. All the pc's have
internet connections. Just no file sharing on those two.
I would love some suggestions. Thankyou - Juan