Problem resolved, here is an explanation for what happened:
I installed an old game published in 2000, and along with it Adobe Acrobat 7.0. It was not the game itself but Adobe, that installed a plug-in that would cause messages in word like "Insufficient memory or disk space, word cannot display this font". As a result, I had text in the game files that would not be recognized by the computer.
How to cure this problem? Uninstall Adobe Acrobat, and restart the computer. Looks like now RUS works fine.
For united Russia!