This update resolves the following issue:
Microsoft has received reports of some customers on a small subset of older AMD processors getting into an unbootable state after you install January 3, 2018—KB4056897 (Security-only update) or January 4, 2018—KB4056894 (Monthly Rollup)
Important Please apply KB4100480 immediately after applying this update. KB4100480 resolves an elevation of privilege vulnerability in the Windows Kernel for the 64-Bit (x64) version of Windows. This vulnerability is documented in CVE-2018-1038.
How to get this update
Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
Known issues in this update
Microsoft is not aware of any issues that affect this update currently.
To install this update, you must have Windows 7 Service Pack 1 or Windows Server 2008 R2 Service Pack 1 installed.
To apply this update, you don't have to make any changes to the registry.
You may have to restart the computer after you apply this update.
Update replacement information
This update does not replace a previously released update.