Кэрол, I still suggest to use your mouse to type Cyrillic chars until you get stickers (or may be just "Russian" keyboard, which has both English and Russian letters imprinted).
In Windows 7 you just bring up "Run" dialogue (Win+R), type "osk", press Enter.
If I understood correctly, you already set up Russian as secondary writing language. Then, the same key combinations will work with On-Screen Keyboard, just as with regular keyboard.