Microsoft’s latest round of security patches appears to be causing some PCs to seize up and display a black screen, rendering the computer useless. The problem affects Microsoft products including Windows 7, Vista and XP operating systems. Microsoft apparently made changes to the Access Control List (ACL), a list of permissions for a logged-on user. The effect is that some installed applications aren t aware of the changes and don t run properly, causing the black screen to be rendered useless.
Source: https://threatpost.com/latest-ms-patches-causing-black-screen-death-113009/73168/