Uninstallation under system account.

Hello,

I have tried to uninstall an application with system account (00.png), but after first uninstallation is finished and pimuninstall.exe process is closed (01.png) - second command line throws an error that Uninstall "Already running... Please exit the alredy running installer or uninstaller first" (02.png).

I am trying to execute command lines below:

"C:\Program Files\PTC\Creo 3.0\M140\Creo 3.0\help\creo_help_pma\bin\uninstall.exe" -quiet
"C:\Program Files\PTC\Creo 3.0\M140\Creo 3.0\help\creo_help_sim\bin\uninstall.exe" -quiet
"C:\Program Files\PTC\Creo 3.0\M140\Simulate\bin\uninstall.exe" -quiet
"C:\Program Files\PTC\Creo 3.0\M140\Parametric\bin\uninstall.exe" -quiet

Does it possible to uninstall application silently using system account?

Thank You in advance!