In recent days, Windows 11 users have been encountering difficulties while attempting to launch specific apps. The problem appears to have begun after users installed the most recent KB5013943 cumulative update. The update was designed to address security flaws and issues. It had to specifically solve a flaw that prevented.NET Framework 3.5 programs from opening if they utilized the Windows Communication Foundation (WCF) and Windows Workflow Foundation (WWF) components.

However, many users are now reporting encountering the 0xc0000135 error while attempting to utilize programs like ProtonVPN, Event Viewer, Sound Blaster Command, KeePass, Visual Studio, and Discord. This recently found problem in Windows 11 appears to be wreaking havoc by crashing some user’s devices with the dreaded Blue Screen of Death too. In the worst-case scenario, it even initiates the most deadly boot loop. In this article, we will look at “How to fix KB5013943 causing application errors?”

What is the “Blue Screen of Death” error?

The vulnerability originates with the May 2022 Update for Windows 11, and regular home customers merely downloading updates are also affected. In other words, the current flaw in Windows 11 impacts both individuals and businesses. “After installing 2022-05 Cumulative Update for Windows 11 for x64-based Systems (KB5013943) and 022-05 Cumulative Update for.NET Framework 3.5 and 4.8 for Windows 11 for x64 (KB5013628), the Microsoft Studio 2 will fail to launch, throwing error BSOD “APC Index Mismatch.” Then it would boot to the operating system, repeating the issue on the next shutdown and startup. “The problem appears to be intermittent,” one of the affected customers remarked. One of the reasons individuals opt to postpone upgrades is because of issues like the Blue Screen of Death, boot loops, and program crashes. If you do not postpone or stop updates in the event of a security update, Microsoft will download and automatically deploy the patch to a Windows 11 PC, which might be inconvenient.

Enabling the.NET 3.5 frameworks using Command Prompt:

Follow the appropriate steps to enable the NET 3.5 framework using the command prompt in the device:

 Step 1: In the search box, type “Command Prompt” and choose run as administrator.

Step 2: Enter each of the following instructions after typing them:

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

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

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

Uninstalling the KB5013943 Update:

Follow the appropriate steps to uninstall the KB5013943 update in the device:

Step 1: Select Windows Update from the left sidebar in Settings.

Step 2: Click “Update History” on the Windows Update page.

Step 3: Then, uninstall the KB5013943 Update.

Step 4: Select “Uninstall Updates” from the Related Settings section.

Step 5: To uninstall an update, first choose it from the list and then click “Uninstall”.

Step 6: When prompted, select “Yes” to proceed.

Enabling the NET 3.5 Framework in the Control Panel:

Follow the appropriate steps to enable the NET 3.5 Framework in the control panel using the device:

Step 1: Open the Control Panel.

Step 2: Then, go to Programs.

Step 3: Click the Turn the Windows Feature on or off.

Step 4: Check the.NET Framework 3.5 (includes.NET 2.0 and 3.0) and Net Framework 4.8 Advanced Services boxes, then enable the.NET 3.5 Framework from the Control Panel to view the modifications.

Uninstalling the Windows 11 May 2022 Update:

Uninstalling a Windows update will be useful if your machine is functioning oddly after recent patch deployment.  Installing security updates as soon as feasible is typically a good approach, and we don’t advocate uninstalling security updates unless absolutely necessary. If your device isn’t functional, you’ll want to be able to roll back security upgrades to address app problems or Blue Screen of Death issues until a new update is available.  Fortunately, whether you installed a security update today or yesterday, you may still delete it. Follow the appropriate steps to uninstall the Windows 11 May 2022 Update on the device:

 Step 1: Firstly, navigate to Settings.

 Step 2: Select “Windows Update”.

Step 3: Navigate to the Update history screen.

Step 4: Under the “Related settings” section, look for the Uninstall updates option.

Step 5: Then, choose the update.

Step 6: Select “Uninstall”.

Step 7: Reboot the computer.