Make sure that in each PC you have set at least one folder as "shared" in its Properties. This is in addition to the overall enabling of File & Printer Sharing and in XP is done by right clicking the folder and selecting the "Sharing & Security" option. It should be very similar in Windows 95.
I suspect that a firewall is the reason that each PC can only see itself and not the remote one and, in any case, the normal advice is not to use multiple software firewalls in one PC as this can cause conflicts. Ideally use one third-party software firewall and disable the Windows one. Configure it to allow access to the networked computers, which is normally done by adding their IP addresses to the "trusted" area or by adding the Subnet - in this case 10.0.0.0 with Subnet Mask 255.0.0.0