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Windows 7 Ultimate x64.

The TrustedInstaller service is failing to start with an error about a file missing, and sure enough C:\Windows\servicing\TrustedInstaller.exe is missing.

What is the easiest way to restore this file? I can't run SFC from within widnwos,because that results in the error "Windows Resource Protection could not start the repair service"... which happens if teh trusted installer service is not running.

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The following two commands will allow write access to the Servicing folder:

takeown /f c:\windows\servicing
icacls c:\windows\servicing /grant administrators:F

Once that is done TrustedInstaller.exe can be copied from another Windows 7 x64 system, and the Trusted Installer service started.

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