Download PSEXEC.exe if you don't already have it. Put it in your root dir. bring up a command prompt, change to root dir and type in psexec -i -s cmd.exe This brings up another command window that runs under the system account. Then change to dir where the batch file is and type it in, exp John.bat.
I ran the first line of your batch file in this way and it said cannot find the file specified.