The problem is when I clicked "My network place" I could not see both computers, therefore I cannot shares all the files from both computer, the computer name is configured and both pcs in the same workgroup, but when I try to access the shares files, the error message as follows

"\\pc is not accessible. You may not have permission to use this network resource. Contact the administrator of this server to find out if you have access permission.

The network path was not found.

How to fix this problem.. help!

The computer at \\pc is not configured to allow browsing the shares. Try going direct to the share \\pc\share

You are most likely in a "workgroup" and you will have no trusted permissions between PC's either way.

\\a PC is not accessible. You might not have permission to use this network sesource. Contact the administrator of this server to find out id you have access permissions.