Win95 network problem

I have a 2 win98 computers and one win95 computer networked with cat5, 3 com pci nic’s in each computer,3 com hub. The win98 computers see each other just fine, but the win95 computer only sees itself – not the other 2. I have all 3 computers setup to share their hard drives and printers. I have checked settings, workgroup name -I’m going crazy – any help? last night I downloaded the newest upgrade for win95 and installed it on the win95 computer. Sharon