Windows 10: .NET 3.1.19 update failure 0x80070643

Hi,Im having some trouble with an update through Windows Update, concerning .net 3.1.19 with error code 0x80070643 as in subject.

:)

 

Microsoft .Net Framework update error 0x80070643

Uninstalled Microsoft .Net Frameworks (All) due to some issues. Was finally able to reinstall .Net 1 to 3.5. Nothing above that will install. I tried NetFxRepairTool, , dotNetFx40_Full_setup, vs_community****.1509654832, and QuickBooksDesktopInstallDiagnosticTool.
Nothing will get it back. I installed VSCodeUserSetup-x64-1.30.2, but that didn't add them.

Here's the kicker. netfx_setupverifier says I only have 1 to 3.5 installed.

NDP4#(#)-KB3045557-x86-x64-AllOS-ENU says they're all already installed:

• .NET Framework 4.#(#) or a later update is already installed on this computer.

AspNetMVC3, AspNetMVC4, AspNetWebFxUpdate_KB2992080 and AspNetWebFxUpdate_KB2994397 say the following:

• Error writing to file: System.Web.Mvc.dll. Verify that you have access to that directory.
• On Retry: The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2350.

(What directory is that?)

Windows update throws an error for:

• Security Update for Microsoft ASP.NET MVC 3 (KB2993937) - Error 0x80070643
• Security Update for Microsoft ASP.NET MVC 4.0 (KB2993928) - Error 0x80070643
• Security Update for Microsoft ASP.NET MVC 5.0 (KB2992080) - Error 0x80070643

(I assume it's because of the MVC error above.)

Reformatting my computer is my very last option. Is there a way to force the .Net Framework 4.## to reinstall?

**Original Title**

.Net Framework Hosed

 

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

Hi Martha,

I suggest you to follow the steps from the article below and check if it helps.

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


https://support.microsoft.com/kb/976982

Note: The troubleshooting steps in the above links are meant for windows 8, however, you can use the same for windows 10.



Hope this information is helpful.

 

Error 0x80070643 can't update Microsoft apps

Hi,



Thank you for posting your query in Microsoft Community.



Windows Update error 80070643 can happen for several reasons. The most common cause is a problem with the .NET Framework installed on the computer. I would also suggest you to follow the steps from the article below and check if it helps.

Method 1: .NET Framework update installation error: "0x80070643" or "0x643"


Fix Windows Update errors



Method 2: I would suggest you to run Windows update troubleshooter and check if issue persist. I would suggest you to check for the update history to look for any pending updates.

You can follow the steps:

• 
  Type Troubleshooting in the search box present in the Taskbar.
  
• 
  Select Troubleshooting.
  
• 
  Select View all on the top left corner.
  
• 
  Run Windows update Troubleshooter.
  

Hope the information is helpful. Keep us posted on the status for further assistance.