How to fix KB5013943 causing application errors?

Question

Issue: How to fix KB5013943 causing application errors?

Hello. I recently installed the latest Windows updates and I keep receiving errors when I try to open my applications. What could be the problem?

Solved Answer

Recently, Windows 11 users started experiencing errors when trying to launch certain applications. The issue seems to have started after people installed the latest KB5013943[1] cumulative update. The update was supposed to fix security vulnerabilities and bugs. Specifically, it had to fix a bug causing .NET Framework 3.5[2] apps not to open if they used the Windows Communication Foundation (WCF) and Windows Workflow (WWF) components.

However, now many people report specifically receiving the 0xc0000135 error when trying to use apps such as ProtonVPN, PowerShell, Event Viewer, Sound Blaster Command, KeePass, Visual Studio, Discord, and ShareX. The full error message reads as follows:

The application was unable to start correctly (0xc0000135). Click OK to close the application

The KB5013943 update seems to have made the situation worse and users are flooding the forums looking for solutions. In this guide, you will find 3 steps that could help you fix the KB5013943 causing application errors. If they do not work, you may have to wait for Microsoft to release another fix.

You can also use a maintenance tool like ReimageMac Washing Machine X9 that can fix most system errors, BSODs,[3] corrupted files, and registry issues. Otherwise, follow the step-by-step instructions below.

How to fix KB5013943 causing application errors

Method 1. Enable .NET 3.5 framework in the Control Panel

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  • Go to Control Panel and click on Programs
  • Pick the Turn Windows features on or off option
  • Make sure .NET Framework 3.5 (includes .NET 2.0 and 3.0) and Net Framework 4.8 Advanced Services are checked

Enable .NET 3.5 framework in the Control Panel

Method 2. Enable .NET 3.5 framework using Command Prompt

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  • Type command prompt in the search and choose run as an administrator
  • Type in the following commands and press Enter after each one:

dism /online /enable-feature /featurename:netfx3 /all

dism /online /enable-feature /featurename:WCF-HTTP-Activation

dism /online /enable-feature /featurename:WCF-NonHTTP-Activation

Enable .NET 3.5 framework using Command Prompt

Method 3. Uninstall the KB5013943 Update

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Before proceeding, keep in mind that this can leave your device unprotected from the latest security threats.

  • In Settings, from the left sidebar, select Windows Update
  • On the Windows Update page, click Update History

Uninstall the KB5013943 Update

  • From the Related Settings section, choose Uninstall Updates
  • To remove an update, select it in the list and then click Uninstall

Uninstall the KB5013943 Update2

  • Click Yes in the prompt to continue

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Recover your lost files quickly

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About the author
Jake Doe
Jake Doe - Computer technology geek

Jake Doe is the news editor at UGetFix. Since he met Ugnius Kiguolis in 2003, they both launched several projects that spread awareness about cybercrimes, malware, and other computer-related problems.

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