Repair Install Windows 10 with an In-place Upgrade  

Thanks @Brink.

Another way to determine base language:
To find out which language your device came installed with, open the Start screen or menu, type "powershell" and launch Windows PowerShell. In the dark blue window, type
[CultureInfo]::InstalledUICulture
and press the Enter key.

See System Default UI Language of Windows 10

Matthew Wai said:

Run (Bcdedit)|Find "locale" via elevated Command Prompt, and you will find the language.

Code:

Microsoft Windows [Version 10.0.18362.30]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\Windows\system32>(Bcdedit)|Find "locale"
locale                  en-us
locale                  en-us

I installed Windows from "Win10_1903_V1_English_x64.iso".
If I have understood correctly, English = English (US) = EN-US = American English.

Technically:

1033 en-US English (United States)

Brink said:

See System Default UI Language of Windows 10

- that would be useful to have linked around here in the tutorial:

The installation media (ex: ISO or USB) must be the same base language (aka: system default language) as your currently installed Windows 10. If it's not, then you will not keep anything.

dalchina said:

- that would be useful to have linked around here in the tutorial:

It is linked to the word language there.

iamc3k said:

A question for the cognescenti: I always remove every drive except the target OS drive from my machine before installing Windows. (The one time I didn't, I had bizarre issues. I finally found out that some OS files were in a non-C drive.)

I have a machine with some DISM library issues and it seems an in-place upgrade (repair install) is going to be the best way to repair it.

This computer has several drives:

(Ignore K: that's my mounted Win10 ISO.) It has seven physical drives, all simple one-partition drives. 2 NVMe, 2 SSD, and 3 Spinners.

Should I remove/disconnect all but the C drive?

Is that a best practice, or is it unnecessary in the case of a repair install?

Thanks,
Ken

Hello Ken,

Usually, it's not necessary to disconnect all drives other than the Windows drive when doing a repair install, but you can to be extra safe.

You do for a clean install though.

Shawn, I'm doing a repair install of 2004 19041.388 and the process is different that what you have documented here for using an ISO.

The first window I get is this:


The next I get is this:


No opportunity to bypass checking for updates. STeps 8, 9 and 10 don't appear any more.

Hello Rich @Ztruker,

I'll do a test on a VM with this build tomorrow to see if I get the same, and will report back.