Viewing shared files on workgroup

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Quick rundown.

I've been assigned at work to set up a "workgroup" and make all of the files and folders on each computer sharable. All computers are similar make/model, windows 7, no passwords.

-I've turned on the network sharing via Advanced Sharing Settings, as well as the other required settings. No password protection.
-I've clicked on the C drive for each computer and made sure authorized users have full control.
-Made sure the Windows Firewall was allowing file and printer sharing.

Unfortunately, I'm still receiving the dreaded message, "You do not have permission to access \\PCNAME"

Any help is much appreciated.

 

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Between two computers, I've also created user accounts with the same names. That didn't work either.

 

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One computer can view/edit the other's drives, however, the opposite is not true... unfortunately.