Please help!

I need to have two viewers on my PC , one English for personal use and one Japanese for my work and I could do that before saving them in different directories but after I had problems with japanese viewer I reinstalled it and now it always installs on top of my English viewer so I cant have both anymore...Is there a way to change the language of interface inside the viewer? Or a way to ahve both viewers on the same PC? Please help!

While I unfortunately can't tell you what to do exactly, only because I can't find a listing of the language setting code, I believe that you may not even need two installs for it. I think what you could do is this:
Install in Japanese - This should give you a shortcut on the desktop with Japanese UI, etc.
Copy the shortcut, name it something like "English version"
Right click the shortcut and go to properties.
From here, on the Shortcut tab, the "Target" textbar should say "-set SystemLanguage" after the actual destination. I don't know what it will say after "-set SystemLanguage" when Japanese is the default language, but for the new shortcut, try en-us
If I'm understanding your issue, and what this option does, this should make it so that using this shortcut will make the UI in English, and the previous shortcut will be in Japanese.

Thank you soooo much Hg!!!! It's so simple and brilliant and I would have never thought of that. It's working!!! Thank you so much!!!!