How to remove a Windows XP System Environment

How to remove a Windows XP System Environment Variable through a batch file with non admin access. This is what‘s currently set as a system environment Variable: PDM_LDB_PATH %ptc_drive%\data\prowork Doing the following and does not allow the user without admin access to make changes. setx PDM_LDB_PATH "" -m (this makes the path blank) Any ideas

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