If MultiPlayer version 3 has not been uninstalled properly, the steps to remove it completely from your system are as follows:
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Start the Registry Editor
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Delete "HKLM\SOFTWARE(\WOW3264NODE)\Ingenieurbüro Holzinger\MultiPlayer V3"
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Delete "HKLM\SOFTWARE(\WOW3264NODE)\Microsoft\Windows\CurrentVersion\Uninstall\MultiPlayer V3"
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Delete "HKLM\System\CurrentControlSet\Services\ProcessManager"
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Reboot
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Delete the directory "C:\Program Files (x86)\MultiPlayer V3"