>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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