Multilanguage user interface

Greetings!

The situation is as follows. The "Czech" windows are installed on the computer. Some "Russian" games "do not go" under these conditions.
Is it possible to "switch" the windows language (some auxiliary Packs or addons) without reinstalling the whole software (not meaning switching the "keyboard language").
I heard that there is something like a "multilanguage user interface". And with what "it is eaten"?
Thanks.
: roll: