January 18, 2018 - KB4075199 (OS Build 10240.17741)

Applies to: Windows 10 Enterprise released in July 2015

Improvements and fixes

This update includes quality improvements. No new operating system features are being introduced in this update. Key changes include:

  • Addresses issue where some customers with AMD devices get into an unbootable state.

If you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.

For more information about the resolved security vulnerabilities, see the Security Update Guide.

Windows Update Client Improvement
Microsoft will release an update directly to the Windows Update Client to improve Windows Update reliability. It will only be offered to devices that haven't installed the most recent updates.

Known issues in this update

Symptom Workaround
When calling CoInitializeSecurity, the call will fail if passing RPC_C_IMP_LEVEL_NONE under certain conditions.

When calling CoInitializeSecurity, the call may fail when passing RPC_C_AUTHN_LEVEL_NONE as the authentication level. The error returned on failure is STATUS_BAD_IMPERSONATION_LEVEL.
Change the authentication level parameter to RPC_C_AUTHN_LEVEL_CALL.
Microsoft is working on a resolution and will provide an update in an upcoming release.
Due to an issue with some versions of antivirus software, this fix only applies to machines where the antivirus ISV has updated the ALLOW REGKEY. Contact your antivirus AV to confirm that their software is compatible and have set the following REGKEY on the machine


Value Name="cadca5fe-87d3-4b96-b7fb-a231484277cc"



How to get this update

To get the standalone package for this update, go to the Microsoft Update Catalog website.

File information

For a list of the files that are provided in this update, download the file information for cumulative update 4075199.

Source: https://support.microsoft.com/en-us/...date-kb4075199

Direct download links for KB4075199 from Microsoft Update Catalog:

Download KB4075199 MSU for Windows 10 LTSB Version 1507 32-bit (x86) - 479.2 MB

Download KB4075199 MSU for Windows 10 LTSB Version 1507 64-bit (x64) - 892.8 MB