If you ever encounter in a local network between desktop-desktop or desktop-laptop(wireless or cable) acces denied (You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions). You should do:

Click START

RUN

Type regedit and press enter

Now find the following key – HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

Double click on ‘restrictanonymous’ and change the Value Data from 1 to 0

Exit regedit and reboot the computer

Now when you click on the computer (using My Network Places) you are trying to get the shared files from the message will not appear and you can access the shared files.