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Windows 7: 4.0 Framework installation :Error Code 643

02 May 2016   #1

Seven 64
4.0 Framework installation :Error Code 643

also known as: .NET Framework update installation error: "0x80070643" or "0x643"

I've googled and tried everything I've came across and still no luck with installing 4.0 Framework

this only started happening once I used a tool to change my Windows install from professional to home, (i installed the wrong version and my key didn't work) so i used a tool to downgrade my account so i could activate windows

the tool i used was called: "Windows 7 Downgrader" and when the problem started happening (no longer able to run daemon tools)

I'm unable to run : System Info - See Your System Specs
as that also requires the framework i can't install.

  • I've disabled (and even uninstalled) my Norton antivirus
  • I've run the Microsoft Fixit
  • I've run the NetFxRepair Tool
  • I've run the dotnetfx cleanup tool and re-installed versions 1, 1.1 SP and 35 (35 won't install and throws an error saying to install 4.0)


OS Version = 6.1.7601, Platform 2, Service Pack 1
OS Description = Windows 7 - x64 Home Premium Edition Service Pack 1
CommandLine = E:\6a7e1311c8e7f880805be9\\Setup.exe /x86 /x64
TimeZone = GMT Daylight Time
Initial LCID = 2057
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 (E:\6a7e1311c8e7f880805be9\SetupUtility.exe) succeeded.
Exe Log File: dd_SetupUtility.txt
ServiceControl operation succeeded!
ServiceControl operation succeeded!
Exe (E:\6a7e1311c8e7f880805be9\Windows6.1-KB958488-v6001-x64.msu) failed with 0x240006 - (null).
Exe (E:\6a7e1311c8e7f880805be9\SetupUtility.exe) succeeded.
Exe Log File: dd_SetupUtility.txt
MSI (E:\6a7e1311c8e7f880805be9\netfx_Core_x64.msi) Installation failed. Msi Log: Microsoft .NET Framework 4 Setup_20160502_225627285-MSI_netfx_Core_x64.msi.txt
Final Result: Installation failed with error code: (0x80070643), "Fatal error during installation. " (Elapsed time: 0 00:00:07).

My System SpecsSystem Spec
02 May 2016   #2

Seven 64

Famework.NET repair tool fixed the issue, had to click next instead of finish.. and it repaired my 4.6 version
My System SpecsSystem Spec

 4.0 Framework installation :Error Code 643

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