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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 Windows, because that results in the error "Windows Resource Protection could not start the repair service"... which happens if the trusted installer service is not running.

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up vote 3 down vote accepted

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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You can find trustedInstaller from your PC by seraching it.

In a command line, type :

dir trustedinstaller.exe /A /S

On my computer the TrustedInstaller was found under :


I guess if you search the folder named "amd64_microsoft-windows-trustedinstaller SOMETHING" you will find it easily.

Don't worry about the AMD the machine was intel and this has nothing to do with amd OR intel;

Its size is 194 048 bytes.

If you follow the previous advice (icacls, takeown)...

then you can copy that copy to the "c:\windows\servicing" directory

Restart the computer and it should work.

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