This article describes an issue that occurs when you upgrade network drivers or install network filter drivers in Windows 7 Service Pack 1 (SP1) or Windows Server 2008 R2 SP1. A hotfix is available to resolve this issue. The hotfix has a prerequisite.
In several minutes after the computer freezes, the computer may crash with a "0x0000009F" Stop error message.
Hotfix informationA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain 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 do not 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 do not see your language, it is because a hotfix is not available for that language.
PrerequisitesTo apply this update, you must have Service Pack 1 installed in Windows 7 or Windows Server 2008 R2.
Registry informationTo use the hotfix in this package, you do not have to make any changes to the registry.
Restart requirementYou may have to restart the computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace a previously released hotfix.
CauseThis issue occurs because an internal client reference counter is not decremented correctly, and that causes the tcpip.sys driver freeze when it is unbinding from the miniport driver.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.