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

I have trouble installing any .NET Framework on my Windows 7 x64 machine, I keep getting the following logfile, what might cause this?

OS Version = 6.1.7601, Platform 2, Service Pack 1
OS Description = Windows 7 - x64 Ultimate Edition Service Pack 1
CommandLine = C:\09b8fe547577883fe82c\\Setup.exe /x86 /x64
TimeZone = Mitteleuropäische Zeit
Initial LCID = 1031
Using Simultaneous Download and Install mechanism
Operation: Installing
Package Name = Microsoft .NET Framework 4 Setup
Package Version = 4.0.30319
User Experience Data Collection Policy: AlwaysUploaded
Number of applicable items: 11
Exe (C:\09b8fe547577883fe82c\SetupUtility.exe) succeeded.
Exe Log File: dd_SetupUtility.txt
ServiceControl operation succeeded!
ServiceControl operation succeeded!
Exe (C:\09b8fe547577883fe82c\Windows6.1-KB958488-v6001-x64.msu) failed with 0x240006 - (null).
Exe (C:\09b8fe547577883fe82c\SetupUtility.exe) succeeded.
Exe Log File: dd_SetupUtility.txt
MSI (C:\09b8fe547577883fe82c\netfx_Core_x64.msi) Installation failed. Msi Log: Microsoft .NET Framework 4 Setup_20150116_161918591-MSI_netfx_Core_x64.msi.txt
Final Result: Installation failed with error code: (0x80070643), "Schwerwiegender Fehler bei der Installation. " (Elapsed time: 0 00:00:11).

I have pasted a LOGfile from the MSI file, can you please take a look?

https://paste.ee/p/zXSWH

The main problem seems to be the following information I found in the setup log (see line 2981 to 2999 in the log above):

MSI (s) (78!78) [16:11:30:749]: SECUREREPAIR: Failed to CreateContentHash of the file: 1033\SetupResources.dll: for computing its hash. Error: 997
MSI (s) (78!78) [16:11:30:750]: SECREPAIR: Failed to create hash for the install source files
MSI (s) (78!78) [16:11:30:750]: SECUREREPAIR: SecureRepair Failed. Error code: 3e5F7CE34B8
Aktion gestartet um 16:11:30: CA_NgenUpdateHighestVersion_I_RB_amd64.3643236F_FC70_11D3_A536_0090278A1BB8.
MSI (s) (78!78) [16:11:30:753]: 

The only information I found concerning problems with Secrepair is KB2918614, which I completely uninstalled, rebooted, but the problem persists. Furthermore, I have reinstalled KB2918614, applied its Hotfix (KB3000988), and the problem still persits.

It happens with .NET Framework 4.0 and 4.5, no matter which of these I try to install.

I first noticed this problem when trying to apply the update for .NET 4.5.2, which failed, so I uninstalled .NET framework 4 and 4.5 completely, and am now unable to install any of these.

Do you have any ideas what might be causing this strange behaviour?

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.