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Microsoft's April 2019 Updates are Causing Windows to Freeze - BleepingComputer

Microsoft's April 2019 Updates are Causing Windows to Freeze - BleepingComputer


Microsoft's April 2019 Updates are Causing Windows to Freeze - BleepingComputer

Posted: 11 Apr 2019 12:00 AM PDT

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Conflicts between antivirus software and the recent Microsoft April 2019 Patch Tuesday updates are causing Windows 7, Windows 8.1, Windows Server 2012, and Windows Server 2012 R2 to freeze, be unable to boot, or hang on installing updates.

According to support articles from Microsoft, Avast, Avira, and Sophos, there is a conflict between some of the recent updates and antivirus software such as Sophos Endpoint Protection, ArcaBit, AVG Business Edition, Avira antivirus, and Avast for Business and CloudCare.  

In Sophos' support article they state that the updates could cause Windows to fail to boot. Reports from users also indicate that the update process may hang at the Configuring Updates stage.

"After installing the following Microsoft Windows updates, Sophos has received reports of computers failing to boot. Sophos is actively investigating this issue and will update this article when more information is available."

Sophos is reporting conflicts with the following updates:

Avast has indicated that the KB4493472 and KB4493448 updates are causing problems, as well as an additional KB4493435 update. KB4493435 is a Cumulative security update for Internet Explorer.

Finally, Avira has stated that KB4493509 for Windows 10 and KB4493472 and KB4493448 for Windows 7 will cause Windows to operate slower than normal. They suggested uninstalling these Windows updates for now until they can release a fix.

"We could reproduce the described behavior. This is occurring because of a current Windows Update."

Microsoft is aware of the issue and has added the following known issue to the knowledge base articles for affected updates. To prevent further issues, Microsoft has placed a block on the conflicting updates so that they are not offered to users running Sophos Endpoint until a solution is made available.

Symptom

Workaround

Microsoft and Sophos have identified 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. Microsoft has temporarily blocked devices from receiving this update if the Sophos Endpoint is installed until a solution is available. For more information see the Sophos support article.

It should be noted that at this time, Microsoft has not mentioned the conflict with Avast or Avira products and it is not known if the updates are being blocked for those users as well.

How to resolve freezes and boot loops

If Windows fails to start, freezes, or gets stuck at Configuring Updates after installing the April 2019 updates, you may have to remove the update to get Windows working properly.

Sophos recommends the following steps to remove the updates from an affected computer:

  1. Boot into safe mode
  2. Disable the Sophos Anti-Virus service
  3. Boot into normal mode
  4. Uninstall the Windows KB
  5. Enable the Sophos Anti-Virus service
    • If enabled, Tamper Protection will need to be disabled to re-enable the service 

Avast recommends that you boot your computer into Safe Mode and then uninstall the B4493472, KB4493448, and KB4493435 updates.

Windows 10 may also be affected

G√ľnter Born of Borncity.com has also stated that there are reports that Windows 10 may be affected as well.

According to Born, he has had reports from Windows 10 users who are having similar issues when Sophos is installed. For users who are affected, he recommends that the following updates be uninstalled:

  • Windows 10 1709: KB4493441
  • Windows 10 1803: KB4493464
  • Windows 10 1809: KB4493509
  • Windows 10 1903: KB4495666

Update 4/11/19 11:50 AM EST: Added information about Avira being affected as well. Thanks SleepyDude!

Update 4/12:19 8:05 PM EST: Microsoft has updated the known issues for KB4493446,  KB4493472, and KB4493509 to indicate that ArcaBit antivirus is having issues as well.

Microsoft and ArcaBit have identified an issue on devices with ArcaBit antivirus software installed that may cause the system to become unresponsive upon restart after installing this update.

We are presently investigating this issue with ArcaBit and will provide an update when available.

For more information, see the Arcabit support article

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