The update KB2902892 screwed up my windows. After install and restart the non-unicode characters like Japanese and chinese became squares in apps like winamp and dota 2. Uninstall then restart and everything is back to normal. I'm using windows 8.1 pro x64 and never use Skype anyway. So I suggest you stay away from it if you were like me. If it's only my problem please tell me how to fix it. About setting non-unicode display into Japanese solve this problem but then windows update will install a whole bunch of new updates that make my PC slow down, I already experienced it in windows 7 and 8, so this is not the solution for me. Thank you.