Windows 11 KB5012643 Crashes Some .Net Apps: Uninstall It if So - MiniTool

Windows 11 KB5012643 update causes some applications to crash? Uninstall the update and restore it to normal!

Many users found that some applications crashed unexpectedly after installing the optional update of Windows 11 KB5012643. This problem is caused by this optional update. Uninstall KB5012643 to restore normal operation of the system. This article will describe this issue in detail.

Windows 11 KB5012643 causes some .NET applications to crash

Microsoft often releases optional updates for Windows 10 and Windows 11 to introduce new features and fixes to enhance the user experience. Windows 11 KB5012643 is an optional cumulative update for Windows 11, with many fixes. For a complete repair list, please refer to: KB5012643 (OS Build 22000.652) preview version.

However, many users reported that Windows 11 KB5012643 caused some .NET applications to crash. What's going on? According to a report from Windows 11 users, the crashed application uses certain components of the .NET 3.5 framework. So, what is .NET Framework?

What is .NET Framework?

When installing updates through Windows Update, you may notice that there are always some updates about the .NET Framework. The following figure is an example:

Additionally, .NET Framework may also appear when installing certain applications. Some applications require a .NET Framework to work properly on your device, as it contains some code that developers can call when creating an application.

Unfortunately, Windows 11 KB5012643 breaks the .NET Framework integration on Windows 11 21H2. Applications that depend on the .NET Framework will be corrupted as a result.

Here is a case on ElevenForum:

There is no complete list of affected applications. However, if some of your applications continue to crash after installing Windows 11 KB5012643, you are encountering this error. To resolve this issue, you need to uninstall Windows 11 KB5012643 from the device. This is an optional update and uninstalling it will not cause any problems.

How to uninstall Windows 11 KB5012643?

Some users don't know how to uninstall Windows 11 KB5012643 from their computers. This section will provide a guide.

Step 1: Click the Start button on the taskbar and go to Settings > Windows Update > Update History .

Step 2: Click Uninstall Update under relevant settings .

Step 3: Find KB5012643 in the update list.

Step 4: Click the Uninstall button next to Update.

Step 5: Click Uninstall in the pop-up window to confirm the operation.

Re-enable .NET Framework 3.5 and Windows Communication Foundation

You can also re-enable .NET Framework 3.5 and Windows Communication Foundation to see if the problem can be resolved. You can do this through Windows feature settings.

Step 1: Click the search icon on the taskbar to enable or turn off Windows features .

Step 2: Select the first result to turn on Windows features.

Step 3: Clear the checkboxes in front of .NET Framework 3.5 .

Step 4: Click the OK button to disable .NET Framework 3.5 and Windows Communication Foundation.

Step 5: Turn on Windows features again.

Step 6: Select the check box in front of .NET Framework 3.5 .

Step 7: Click the OK button to re-enable .NET Framework 3.5 and Windows Communication Foundation.

You can also do the same with a Windows terminal.

Step 1: Right-click Start and select Terminal (Administrator) to open Windows Terminal as administrator.

Step 2: Run the following commands one by one:

• dism /online /enable-feature /featurename:netfx3 /all
• dism /online /enable-feature /featurename:WCF-HTTP-Activation
• dism /online /enable-feature /featurename:WCF-NonHTTP-Activation

Should I install optional cumulative updates for Windows 11?

While the optional cumulative update for Windows 11 contains some new features and fixes, it's best not to install it unless it fixes your specific problem. Sometimes, optional updates can cause problems that are incompatible with your computer. For example, Windows 11 build 22000.652 (Windows 11 KB5012643) is causing more problems. Some users are unable to download and install this update.

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