Microsoft is blocking April 2019 security updates for Windows 7 and Windows 8.1 which have been released recently since many reports claim computers freeze or slow down after installing these updates. Read this post to learn more about the Patch updates, as well as how to fix Windows problems.

April 2019 Patch Updates Cause Windows to Freeze or Slow Down

It is reported that Microsoft’s April 2019 Patch Tuesday updates can cause serious Windows problems. Some users running Windows 7 say that Windows is slower after the April 2019 updates installation, as shown in the following figure:

In addition, the issues that users are encountering include Windows taking a long time to start or reboot, computer lag in games, programs taking forever to open, video streaming issues, excessive disk activity, and so on.

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Actually, Windows 10 may be also affected. One user writes a comment at BleepingComputer that Windows 10 computer has become extremely slow and rebooting/starting Windows takes forever.

Besides, the similar issues will happen on Windows 8.1, Windows Server 2012, and Windows Server 2012 R2 as well.

Why April 2019 updates freeze Windows or cause these similar Windows issues? According to support articles from Microsoft, Sophos, Avast and Avira, there is a conflict between the latest April 2019 Patch updates and antivirus software such as Sophos Endpoint Protection, Avast for Business and CloudCare, Avira antivirus, ArcaBit, and AVG Business Edition.

In the Sophos support article, they state “After installing the following Microsoft Windows updates, Sophos has received reports of computers failing to boot.”

Specific April 2019 Updates and Microsoft Blocks Them

April 2019 Patch updates cause Windows to freeze or slow down. Well then, what are the specific updates?

According to Sophos, its antivirus is conflicted with the following updates:

  • April 9, 2019 – KB4493448 (Security-only update) – Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1
  • April 9, 2019 – KB4493472 (Monthly Rollup) – Windows 7 Service Pack 1, Windows Server 2008 R2 Service Pack 1
  • April 9, 2019 – KB4493467 (Security-only update) – Windows 8.1, Windows Server 2012 R2
  • April 9, 2019 – KB4493446 (Monthly Rollup) – Windows 8.1, Windows Server 2012 R2
  • April 9, 2019 – KB4493450 (Security-only update) – Windows Server 2012, Windows Embedded 8 Standard
  • April 9, 2019 – KB4493451 (Monthly Rollup) – Windows Server 2012, Windows Embedded 8 Standard

Avast has said that the KB4493472, KB4493448, and KB44934356 (Cumulative security update for Internet Explorer) updates are causing Windows problems.

Additionally, Avira has indicated that KB4493509 for Windows 10 and KB4493448 for Windows 7 will lead to Windows running slower than normal. They advise uninstalling these Windows updates at present until a fix is released.

Microsoft has added the following known issue to the knowledge base articles for all affected updates. And it has blocked on the conflicting updates to prevent further issues so that they are not offered to users who are running Sophos Endpoint until a solution is made available.

Similarly, Microsoft has mentioned the conflict with Avast or Avira products. It has added information about Avira being affected as well. What’s more, it has updated the known issues for KB4493446, KB4493472 and KB4493509 updates to indicate that ArcaBit antivirus is also having issues.

How to Fix Freezing and Boot Loop

If Windows gets stuck at Configuring Updates, fails to start or freezes after installing April 2019 Patch updates, it is necessary to remove these updates to let Windows work properly.

Sophos recommends removing the updates from an affected PC by following these steps:

Step 1: Boot into Safe Mode.

Step 2: Turn the Sophos Anti-Virus service off.

Step 3: Boot the computer into normal mode.

Step 4: Uninstall the Windows updates.

Step 5: Enable the Sophos Anti-Virus service. Note that it is necessary to disable Tamper Protection to re-enable the service.

Also, Avast recommends booting the computer to Safe Mode and then remove the KB4493448, KB4493472, and KB4493435 updates.

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Final Words

This isn’t the first time Windows has had issues. As is well known, the October 2018 Windows Update deleted users’ private documents, which is a minor disaster.

To perform a quick disaster recovery after a Windows update, users should back up the Windows operating system before an update. To do this, the professional Windows backup software, MiniTool ShadowMaker, is helpful.

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