Download version 9 or 10 of the Intel Management Engine Interface (MEI) Driver.
Navigate HP's Software and Driver Downloads site (http://www8.hp.com/us/en/drivers.html) to find the latest approved driver for your model. Filter by version, selecting Microsoft Windows 8.1 on the dropdown menu. Look for the download in the "Driver-Chipset" category. If an MEI driver with a version number starting in 9 or 10 is listed, download it. [Version 18.104.22.1680 1.5M (http://ftp.hp.com/pub/softpaq/sp66001-66...) will work for most models.]
If an MEI driver with a version number starting in 9 or 10 is NOT listed, download the appropriate driver directly from Intel (https://downloadcenter.intel.com/search?...). [Version 22.214.171.1240 1.5M (https://downloadcenter.intel.com/downloa...) will work for most models.]
Download the Windows 10 "Show or Hide Updates" Troubleshooter Package (http://download.microsoft.com/download/F...).
Change the Windows Update Services setting from Automatic (Delayed Start) to Manual.
In the Control Panel, select Administrative Tools and open Services.
Scroll down to Windows Update and double-click it to bring up its properties.
Click Stop to stop the service from running.
Change the Startup Type to Manual and click OK.
Install version 9 or 10 of the Intel Management Engine Interface (MEI) Driver. If you receive a dialog warning about replacing a newer version of the software, accept it.
NOTE: You do NOT need to uninstall version 11 before installing version 9 or 10. The presence of some version of the driver is required in order to "upgrade" (or in this case downgrade) it.
Run the Windows 10 "Show or Hide Updates" Troubleshooter Package and hide updates to the Intel Management Engine Interface (MEI) Driver. (Doing so will block your system from automatically reinstalling or showing updates for version 11 of the driver.)
Change the Windows Update Services setting from Manual back to Automatic (Delayed Start).
Restart your computer.
Rejoice! You can finally sleep and shut down again.