Edit C:\Windows\System32\GroupPolicy\Machine\Registry.pol
PReg [ S o f t w a r e \ P o l i c i e s \ M i c r o s o f t \ W i n d o w s \ I n s t a l l e r ; * * d e l . D i s a b l e M S I ; ; ; ]
Ms-Dos/Windows
Unix
Write backup
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