NET framework 4 Installation Failure

Asked By 60 points N/A Posted on -

Hi! Everytime I install .NET framework 4 in my computer I always get an error message that says, Final Result: Installation failed with error code: (0x80070643), "Fatal error during installation. 

What seems to be the problem?

Can you please help me identify the problem and suggest for the best solution?

Answered By 5 points N/A #154824

NET framework 4 Installation Failure


Hi Dave ,

The error code 0x80070643 depicts a corrupted MSI file. This means that the .Net Framework any version installed on your computer is now corrupted. If you are trying to install the version 4, it means you already have the lower versions like 1,2 etc, and now they are now corrupted.


Try first to repair the installed version by using a tool from Microsoft called “FixIt”. You can go to the link and download the tool to your desktop. Click on the tool and run, and follow the instructions provided by the wizard.

After the wizard finish fixing than again try to install the version 4 .net framework. If you still receive the error, then the best solution for you is to uninstall the Framework completely from your system, using the cleanup tool.

This tool can be downloaded by visiting this link.

Extract the files, and then click on cleanup_tool.ex.  and again follow the prompts, by answering yes.

It will remove the .net installation. however if you are on VISTA or win 7 then  .NET Framework 2.0 will not be removed, as it is installed as operating system component.  Now Reboot the computer then Re-Install .net frame work in the following order:

1. Version 1.1  from:

2. 1.1 service Pack from:

3. Version 3.5 SP1 from:

After performing step 3 you will have version 2 sp2 and version 3 sp2 automatically. After Rebooting again try installing version 4, and it should be readily installed.


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