.NET 4 fails to install because SECUREREPAIR fails to CreateContentHash of file SetupResources.dll: for computing hash Error: 997

The solution provided by Thaoden (uninstalling KB2918614, KB3000988 and KB3008627) didn’t work for me. I got the same errors after uninstalling these updates.

What did work for me was the whitelisting workaround suggested by JohnL999 here.

So, what I had to do to make it install:

  1. Create a DWORD named SecureRepairPolicy with value 2 in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer

  2. Create Key SecureRepairWhitelist in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer

  3. In SecureRepairWhitelist, create a String with the product ID you want to whitelist as name. In my case this was {3911CF56-9EF2-39BA-846A-C27BD3CD0685}. You can find out the product ID in the msi log file, some lines before the error

    SECUREREPAIR: Failed to CreateContentHash of the file: 1030\SetupResources.dll: for computing its hash. Error: 997.
    

    It looks like this:

    SECREPAIR: Hash Database: C:\windows\Installer\SourceHash{3911CF56-9EF2-39BA-846A-C27BD3CD0685}
    

    or this:

    SOURCEDIR product ==> {3911CF56-9EF2-39BA-846A-C27BD3CD0685}
    

    Might be a different product ID depending on the MSI you want to install.

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