Try this guys, I was having the same problem and found this fix!
TIP #26: Why do I receive this error message:  “\\MainPC\Main-C ( C ) in not accessible. 
You might not have permission to use this network resource. Contact the administrator 
of this server to find out if you have access permissions.”
 

Windows XP, Windows 2000, and Windows NT all have an IRPStackSize value that controls 
how much physical storage space and RAM are available to new applications, and some 
new software installs incorrectly set this value.

This value ranges from 11 to 20 for XP and from 11 to 15 for Win2K and NT. If you 
set this value to less than 11, you'll receive an error message indicating that the 
system doesn't have enough server storage. As a result, clients won't be able to 
access network shares and Event ID 2011 will appear in the System log.

 

To set the IRPStackSize back to the default (15 for XP, 11 for NT), perform the following 
steps:

 

  1. Start the registry editor (e.g., regedit.exe).

  2. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services

\lanmanserver\parameters.

  3. Double-click IRPStackSize (or if this registry setting doesn't exist, create 
it of type DWORD and ensure the case is correct).

  4. Change the base to decimal, set the value to 11 for Win2K or NT or 15 for XP, 
and click OK.

  5. Reboot the computer.

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