Are you getting error 0x80070bc2 during the installation of Windows uypdate KB4074588 ?
- In the search box on the taskbar, type cmd.
- Right-click Command Prompt in the search results and select Run as administrator. (Select Yes, when prompted by the User Account Control.)
- In the Administrator: Command Prompt window, type the following command and press Enter:
SC config trustedinstaller start=auto
- Restart the PC.
In some cases, a second restart may be required. If you look under Settings > Update & Security and you see the message Status: Awaiting restart, restart the PC a second time to complete the installation.