hmm.........im thinking that there is a setting somewhere that you have to enable in order for the dell to access the folders from the macs. it cant really be the network since the dell sees the computers but just cant access the folders. im thinking that its a user permission issue. are all computers hook behind a a router? ummm.......one thing you can do is if the dell is using a winxp operating system, try performing a network wizard setup. good luck
The thing is you can access the other Mac's through the Dell. I'm starting to think it a problem with the Powerbook.