Hello Swang,
Thank you for posting your query on Microsoft Community.
From the description I see that you are experiencing the issue with language pack on windows 8.1.
This issue can be caused due to language pack advanced settings or due to third-party application conflict. Let’s try to identify the actual cause and troubleshoot accordingly.
I would suggest you to try the following methods:
Method 1:
Follow these steps and check to language pack advanced settings:
- Press Windows key + X key and choose Control Panel.
- Under Clock, Language and Region Click the Change date, time, or number formats.
- On the Formats tab of the Region window, select the country whose formats you want on your computer. Click the Additional setting button on the lower left corner of the Region window.
- You can select number, currency, time, date, tabs to choose options.
- Going back to the Region window, select the Location tab, Select Location from the drop down. Click Apply. Click OK.
- On the Region window, select the Administrative tab. click the Copy Settings button. If you are satisfied with the settings for Current User, select the check box next to Welcome screen and system accounts, which will apply your language choices to more areas of the interface.
Refer below link for more information:
http://support.microsoft.com/kb/2607607
http://windows.microsoft.com/en-us/windows-8/use-different-language-app
If the issue still persists, then try method 2.
Method 2:
There could be possibility of some background programs conflicting with the smooth running of the computer. To help troubleshoot error messages and other issues, you can start computer by using a minimal set of drivers and startup programs. This kind of startup is known as a "clean boot." A clean boot helps eliminate software conflicts.
**How to perform a clean boot in Windows**
Note: After troubleshooting, refer to this section ‘How to reset the computer to start normally after clean boot troubleshooting’.
Hope the information helps. Let us know if you need further assistance with Windows related issues, we’ll be glad to assist you.
Thank you