The language pack hasn't been fully installed

Dear Martin,
Thank you so much for helping me resolve the issue. I really appreciate it.
I've followed your instructions. But unfortunately, my issue hasn't been fully resolved. Some apps (such as Task Manager), some icon's name and menus has changed their language to Vietnamese. But the remaining parts are still in English. I don't know what I have to do next.
Please help me resolve the issue.
And once again, thank you so much

Dear Triệu Việt Anh,

Thank you for reaching out about your issue with the Vietnamese language pack not being fully installed on your Windows 10 PC.

Let's work through a few steps to resolve this without resetting your system.

Step 1: Reinstall the Language Pack

Under Settings > Time & Language > Language, select Vietnamese.

Click Remove. Click Add a language, search for Vietnamese, and select it. Follow the prompts to download and install the language pack completely.

Afterwards, set it as your primary display language if needed.

Step 2: Check Regional and Language Settings

Open Settings > Time & Language > Region.

Ensure Country or region is set to Vietnam.

Go to Control Panel > Clock and Region > Region > Administrative.

Click Copy settings... and make sure your current settings for display language and input language are correctly set to Vietnamese.

In the Administrative tab under Language for non-Unicode programs, click Change system locale... and set it to Vietnamese (Vietnam).

Click OK and restart your computer if prompted.

Step 3: Clear Language Pack Cache

Open Command Prompt as Administrator.

Run the following commands one by one to reset Windows Update components:

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

ren C:\Windows\System32\catroot2 catroot2.old

net start wuauserv

net start cryptSvc

net start bits

net start msiserver

After doing so, attempt to reinstall the language pack through Settings > Time & Language again.

Step 4: In-place upgrade：

• Visit the Windows 10 Download page.
• Under Create Windows 10 installation media, select Download the tool now.
• Launch the Media Creation Tool and choose Create installation media for another PC.
• Select the ISO file and save it locally.
• Once downloaded, right-click on the ISO file and select Mount.
• Run the setup.exe on the mounted drive.
• During setup, choose the option to Keep personal files and apps.
• Follow the on-screen prompts to complete the recovery installation.

If you have any further questions or need additional assistance, please feel free to ask.

Best Regards,

Martin | Microsoft Community Support Specialist