Error 0x80070bc2 during installation KB4074588

(Update - 2/17 Editing for clarity based on feedback)

If you are currently experiencing the 0x80070bc2 error while attempting to install KB4074588, please try this:

1. In the search box on the taskbar, type cmd.
2. Right-click Command Prompt in the search results and select Run as administrator.  (Select Yes, when prompted by the User Account Control.)
3. In the Administrator: Command Prompt window, type the following command and press Enter:

SC config trustedinstaller start=auto 4. 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.

Paul...

I got the message that the specified service does not exist as an installed service.

This is what I get:

PS C:\WINDOWS\system32> sc config trustedinstaller start=auto

Set-Content : A positional parameter cannot be found that accepts argument 'start=auto'.

At line:1 char:1

• sc config trustedinstaller start=auto

    + CategoryInfo          : InvalidArgument: (:) [Set-Content], ParameterBindingException

    + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.SetContentCommand

PS C:\WINDOWS\system32> SC config trustedinstaller start=auto

Set-Content : A positional parameter cannot be found that accepts argument 'start=auto'.

At line:1 char:1

• SC config trustedinstaller start=auto

    + CategoryInfo          : InvalidArgument: (:) [Set-Content], ParameterBindingException

    + FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.PowerShell.Commands.SetContentCommand

PS C:\WINDOWS\system32>

Please tell me where I should include a space!

Thank you so much !! This solution also works for my installation problem with 2018-03 Cumulative Update for Windows 10 Version 1709 for x64-based Systems (KB4088776), Last Failed Install attempt on 3/19/2018-0x80070bc2....

(Update - 2/17 Editing for clarity based on feedback)

If you are currently experiencing the 0x80070bc2 error while attempting to install KB4074588, please try this:

1. In the search box on the taskbar, type cmd.
2. Right-click Command Prompt in the search results and select Run as administrator.  (Select Yes, when prompted by the User Account Control.)
3. In the Administrator: Command Prompt window, type the following command and press Enter:

SC config trustedinstaller start=auto 4. 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.

Paul...

I got the message that the specified service does not exist as an installed service.

I did it exactly like you said and it fixed the problem!! It did require the 2nd restart, though.

Thanks!