well the first clue is that "c:\winnt\system32\cmd.exe" is NT specific. Should be %comspec%.
But then you probably are not using "c:\winnt\system32\cmd.exe" or else you would not be getting an "invalid switch" error.
I don't have any Wintendos to test on but my guess it the /Q switch. Spark up a DOS box and enter COMMAND /? to see the valid switches.
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