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Microsoft April’s update causing PC to freeze

by Apr 12, 2019PTSI, update, Windows

Is your computer stuck on installing updates, unable to boot, or freezing overall recently?

Here is all the information we know for the cause of this issue and a temporary fix to it, until of course a solution is available.

On Tuesday, April 9, Microsoft released its latest update, one for which included security features and fixes on a few bugs. Read more about this update here. Unfortunately, after these updates, there has been several reports from users stating problems with their machines freezing and/or getting hang while booting the system.

Who was affected?

This new update conflicted with several Antivirus software, affecting users of Windows 7, Windows 8.1, Windows 10, Windows server 2008, Windows server 2012 and Windows Server 2012 R2

Microsoft confirmed that “an issue on devices with Sophos Endpoint Protection installed and managed by either Sophos Central or Sophos Enterprise Console (SEC) that may cause the system to freeze or hang upon restart after installing this update.”

In addition, users of Avast for business, Cloudflare and Avira have been reporting computers running extremely slow or not able to boot completely after restarting – Which may well indicate for this update to have affected not just Sophos antivirus software but these three as well.

On the other hand, and one might say for the good news, Microsoft disabled or at least blocked this new update for users who have Sophos Endpoint Protection installed on their machines, until a solution is available. Read Sophos support article. Unfortunately, thousands of devices have already been affected by this update. Luckily, there’s a temporary fix to this, If you happen to be affected by this issue.

Affected users with Antivirus

  • Sophos End-Protection
  • Avast for Business
  • Cloudflare
  • Avira

Affected Operating systems

  • Windows 7
  • Windows 8.1
  • Windows 10
  • Windows Server 2008
  • Windows Server 2012
  • Windows Server 2012 R2

How to resolve this issue?

Here is what these specific companies are recommending if your computer is running slow and freezing a lot.

Uninstall these Windows updates until they release a fix.

To revert or uninstall updates:

  1. Click on Windows Icon
  2. Settings
  3. Windows Update & Security
  4. View update history
  5. Uninstall updates

If your computer is unable to boot, fails to start, or gets stuck on updates, Sophos antivirus recommends these steps:

  1. Boot into safe mode
  2. Disable the Sophos Anti-Virus service
  3. Boot into normal mode
  4. Uninstall the Windows update
  5. Enabled back the Sophos Anti-Virus service

For Avast users, they recommend to boot into safe mode and uninstall the following updates:




All in all, reverting updates should fix the issue. If you’re not sure how to boot into safe mode, don’t worry. Here is how to boot into safe mode.

PTSI Editorial Team

Support Line: Phone: +1 646-535-HELP (4357) Email: Support web: