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In order to deinstall POS PSIM, run the following command in the wmic.exe utility:
/NODE:"Computer_name" /USER:"User_name" /PASSWORD:"Password" product where name="Product_name" call uninstall
Here Product_name is the name under which POS PSIM is installed, usually POS PSIM v.Build_number. The name can be found in the registry in HKEY_LOCAL_ MACHINE\Software\Microsoft \Windows\CurrentVersion\Uninstall section.