Assuming XP, insert the XP CDROM into EACH machine in turn, and from the menu that appears, select 'Additional activities' (or somesuch option) and then 'Setup a home or small office network'. Then, add each PC to the Firewall Trusted zone of the other to allow them to access each other; for XP firewall, edit/change scope of File & Printer Sharing in the exceptions tab. Finally, on the network adaptor of each machine, ensure that File/printer sharing is enabled/installed (should be).
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