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– Open the Registry by typing regedit in the RUN
– Then search/go to HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer
– Locate the registry entry “DisableMSI” (dword)
– You can create(if there is no entry) or modify(if “disablemsi” exist) dword called “DisableMSI”

– Set the value to; 0 (all enable installation); 1 (default-admin only-enable installation); 2 (disable installation)
-Set to Hexadecimal and click Ok.
– Restart Windows.

When a Task Manager Has Been Disabled due to Virus or such, here is a simple Run command to enable it again.

Change the Task Manager Option through the Run Line

1. Click on Start, Run
2. Type the following command exactly and press Enter
REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 0 /f