One of the updates released by Microsoft on Tuesday apparently caused serious crashing problems on Windows 7 and Windows Server 2008 computers. Microsoft has re-issued the update to resolve these problems. Anyone who already installed MS15-115 on affected Windows systems should run Windows Update again to get the new version.

The MS15-115 bulletin has been updated to show the change.

From the associated knowledge base article:

This security update was rereleased on November 11, 2015, for Windows 7 and Windows Server 2008 R2 to resolve the following issues:

* Resolves crashing that occurred in all supported versions of Microsoft Outlook when users were reading certain email messages.
* Resolves problems that occurred while users were logging on to the system. For example, after a user restarted the computer and then pressed Ctrl+Alt+Delete at the logon screen, the screen flashed and then went black. The user was then unable to continue. There may be other, similar logon issues that are related to this issue.