System becomes unresponsive when file system minifilter drivers are installed in Windows 8 or Windows Server 2012

This article describes a memory leak issue that occurs when one or more file system minifilter drivers are installed in Windows 8 or Windows Server 2012. A hotfix is available to fix this issue. Before you apply this hotfix, note that this hotfix has a known issue.

Known issue in this hotfix


If you install hotfix KB2979933 in Windows Server 2012, and then install this hotfix (KB3084426), the fix for hotfix KB2979933 is lost.


To fix this issue, install October 2016 update rollup for Windows Server 2012.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this hotfix. For more information, see Add language packs to Windows.

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that's described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there's a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section doesn't appear, submit a request to Microsoft Customer Service and Support to get the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that don't qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you don't see your language, it's because a hotfix isn't available for that language.


There's no prerequisite to apply this hotfix.

Registry information

To use the hotfix in this package, you don't have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix doesn't replace a previously released hotfix.
File information


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


See the terminology that Microsoft uses to describe software updates.

Article ID: 3084426 - Last Review: Oct 20, 2016 - Revision: 1