Inquisit should present Cyrillic symbols just fine assuming that you are running it on a machine running a Cyrillic version of Windows (e.g., Russian). If you are running it on English Windows, for example, it won't work.
If it's still not working even on Cyrillic Windows, could you let me know what exactly is going wrong. For example, do you see garbage characters on the screen instead of the correct symbols? Also, if you could post some of your <text> or <item> elements containing the Cyrillic characters, I'll test it out and see if I can isolate the problem.