Access Denied

[Helpmeimstuck]

We have 3 computers here, one of which is the main one hosting all the shared files and folders. Completely out of the blue, when trying to access the shared folder a windows appears asking for username and password in order to access the folders. I tried entering Administrator as the username and hitting enter but it then says something along the lines of "So and so computer is not accessible, You might not have permission to use this network resource. Contact the administrator of the server to find out if you have access permissions. Access is denied."

Workgroup's all the same and have even tried closing the firewall on the main computer.

Any ideas?

Thanks in advance.

 

[axgrinder73]

Have your checked the permisions on the resourcs that you are trying to access? You shouls be able to set the "Everybody" group to have full controll.

My question is: what changed?