WU 9926

Two updates are being pushed for Window 10 desktop Build 9926. KB3038357 is Windows 10 Technical Preview update and is described as,

This article describes an update to Windows 10 Technical Preview, KB3038357, released February 10, 2015. This update will be offered though Windows Updates to users of the Windows 10 Technical Preview, build 9926. This update fixes an issue with installing future builds.

KB3037975 is a security update for patching Internet Explorer Flash vulnerability.

You need to restart your system after applying thee updates. The issue with the last update, where branch election was exposed gets fixed with the KB3038357.

Source 1  2