Microsoft Networking

I’ve installed a small network in my house, 4 machines, a print server and a couple of printers. Their are 3 machines in different rooms running from a hub in the attic, with the 4th machine and printer server “uplinked” into another hub.

So that’s where the problem begins, all machines except one reconize the network, however this machine does pick up the print server and I can print from it.

When I try and browse the network, windows says the network is unavaible, I can’t access any onther machine, but TCP/IP and microsoft networking client is installed, what am I doing wrong?

Please help, many thanks Andrew