How can I disable the OS2/POSIX subsystems?

A. A. It is possible to disable one or both of these

  1. Start the registry editor (regedt32.exe, not regedit.exe)
  2. Move to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems
  3. Double click on Optional
  4. On each line is one subsystem, simply remove the one you wish to disable. If you want to disable both, set the value to Null
  5. Click OK
  6. Close the registry editor and reboot

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