เพิ่มภาษาญี่ปุ่นไม่ได้

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Thanks for reaching out! As an independent consultant and Microsoft user, I’m happy to help you.

The issue you’re experiencing when adding the Japanese language pack to Windows 11 is a common one. Error code 0x80070490 is often associated with Windows Update issues when downloading and installing language packs.

This error can be caused by a number of reasons, such as corrupted Windows Update components, network connectivity issues, or incorrect system settings. Unfortunately, there is no easy fix, and fixing the issue typically requires multiple troubleshooting steps.

This issue seems to affect more Japanese language packs than others. Some users have successfully installed other language packs but are still encountering issues with Japanese.

As a workaround, you may want to try using an online Japanese input tool or third-party Japanese IME software. There are several online options available, such as InputKing or the virtual Japanese keyboard on mykeyboard.org that allow you to type in Japanese without installing anything on your computer.