Permission Denied to my application when copying file to share...

[!NoItAll]

My application uses the following code to run a batch file.

        Dim DOSProc As New Process
        With DOSProc
            .StartInfo.UseShellExecute = False
            .StartInfo.FileName = "c:\scripts\copyimages.bat"
            .StartInfo.Arguments = Chr(34) & PPSParam.LatestImageFile & Chr(34) & " " &
                                   Chr(34) & PPSParam.Panelname & Chr(34) & " " &
                                   Chr(34) & PPSParam.Comment & Chr(34)

            .StartInfo.ErrorDialog = False
            .StartInfo.WorkingDirectory = "c:\scripts"
            .StartInfo.CreateNoWindow = True
            .Start()
        End With

The code above was simplified for readability.
It essentially opens a command window and the batch file runs. In this case the batch file is simply copying a file from a location on the local machine to a writable share on the network. I have checked the share and security is set so that Everyone has full access (read/write/delete/etc - all the boxes are checked). If I open a cmd window and run the batch file it works perfectly. But when the above code runs the batch file the copy function gets "Permission Denied"
Any clues what I am doing wrong here?
Could it have anything to do with useshellexecute ?

[!NoItAll]

The problem turned out to be the fact that my program was started by a service running as system. When that happened my program inherited the system user and shares are not available to system users.
I had to change the way the service called my application (it was a service I wrote) so that it would impersonate the "primary console" user (aka the desktop) in Windows.
In order to use this it required several Win32 APIs. At some point I may submit an article here on how this is done - I wound up writing a DLL, but for now suffice to say that processes started by services will have problems with permissions and security until you run the process impersonating the user logged onto the primary console.