KB4038806 breaks browsers and makes PC sluggish, users report

Madalina Dinita
by Madalina Dinita
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Adobe Flash Player KB4038806 issues

Microsoft rolled out KB4038806 for Adobe Flash Player on Patch Tuesday, addressing two critical memory corruption vulnerabilities that could lead to malicious code execution.

Unfortunately, users report that KB4038806 also brings issues of its own. The good news is that none of these bugs are severe, but are nevertheless annoying.

KB4038806 issues

The update breaks Flash

Many users report that although KB4038806 is supposed to patch vulnerabilities in Adobe Flash Player, it actually breaks Flash.  As a result, they had to uninstall the update in order to be able to use their browsers.

I have had problems with yesterday’s KB4038806 update, which is supposed to “resolve vulnerabilities in Adobe Flash Player”, actually breaks it on my system. I’ve had to remove it. Anyone else had such issues?

PCs become sluggish

Some users also report that this update causes PCs to become sluggish. As soon as they uninstalled it, their PCs functioned normally again.

I have just uninstalled this as My PC became sluggish and unusable after installation. Working fine now, my advice AVOID!

Possible HDD power issues

KB4038806 may also be the culprit for all the HDD power issues some users have experienced. However, since users who installed this update also installed KB4038788, it’s still unclear which update actually triggers the issue.

After the latest windows 10 update, my secondary drive keeps powering down, I can’t work out how to stop it? The computer works fine, but after a few seconds of activity, I hear it power down. It never used to do this before the latest update. […]

The updates installed most recently are: 2017-09 Security Update for Adobe Flash Player for Windows 10 Version 1703 for x64-based Systems (KB4038806) and 2017-09 Cumulative Update for Windows 10 Version 1703 for x64-based Systems (KB4038788)

Have you installed KB4038806 on your PC? Did you encounter other issues apart from the ones listed above?


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Yes to all, plus cannot accesss start button and none of the others work Including wifi connections, there’s no sound at all, can’t open images files, folders by. Locking on, or use any ms office functions.

Can’t log off or restart, only the on off button, and it crashes the hard drive, then takes over an hour to restart due to c drive damage.

These ‘updates’ have not helped anything and ruined my machine!

MS updates are not solving problems. According to the diagnostics I did it’s activated known built in kernel coding errors, creating fatal malfunctions…In other words these 2 newest MS updates have triggered previous known vulnerabilities they built into win 10, just as they killed support for previous versions of Windows.

Interesting coincidence?