Just need to make sure the 2 pc's are in the same subnet, that they have the same workgroup name, they share the same usernames and passwords settings in computer management on both, that you have file and printer sharing service loaded under network properties. Also, either turn firewall off or make sure file and printer sharing are allowed under the firewall. You can then either type in the unc path with the IPC share, so \\computername\c$ or you can create a share for the drive or folder on the pc your trying to access and hit it with \\computername\sharename
Hope that helps.