I have class in my WCF service to execute batch file. when I test to run the batch file in shared directory, everything is fine, the batch was executed, but when I try to run the batch file from secure diretory, I get error "ACCESS DENIED". How to add login property so I can access my secured directory to execute my batch file?

here is my code:

public string ExecuteBat()
        {   
            string hasil = "";
            ProcessStartInfo processInfo = new ProcessStartInfo(@"D:\Rpts\SSIS_WeeklyFlash_AAF_1.bat");
            processInfo.CreateNoWindow = true;
            processInfo.UseShellExecute = false;
            Process process = Process.Start(processInfo);
            process.WaitForExit();
            if (process.ExitCode == 0) { hasil = "BAT EXECUTED!"; }
            else { hasil = "EXECUTE BAT FAILED"; }
            return hasil;
        }