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