Keybord CRASH again...

Postscript: After all, I had to set the language to English. After installing FFmpeg 2.2.2, it will freeze again with Japanese settings. What should i do?

Ensure that Windows is fully updated. (There was a Windows bug that caused freezing in Audacity, which has now been fixed).

Ensure that you are using Audacity 3.0.2 or later (There was a bug in Audacity 3.0.0, which has now been fixed).