COM activation change in Windows Vista


In Windows Vista, COM will read HKLM\Software\Classes when the process has a integrity level > MEDIUM, and it will read the merged HKLM\HKCU hive otherwise.

For information about integrity level, please read Steve Riley's article Mandatory Integrity Control in Windows Vista.

This means, for services running at system context, or elevated applications, COM will only read HKLM\Software\Classes.

Comments (3)

  1. Ronald Hamby says:

    I need help to activate my window xp home edition, What I need is help.

               Thank You

              Mr. Hamby

    mrronalde@bellsouth.net

  2. We have recently released an update for VSTO 2005 SE design time support on Vista. The KB article is

  3. We have recently released an update for VSTO 2005 SE design time support on Vista. The KB article is

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