I can't find the language options in Windows Updates (even after update search)There is no language pack for Windows 7 Pro. it is available only for Windows 7 Ultimate Service Pack 1 or Windows 7 Enterprise Service Pack 1.
But I can't find a language pack to enable the Russian characters/alphabet in WindowsBecause it's not available for Windows 7 Pro.
Restart the PC.
Then go to start >> Control panel >> Region and language >> Keyboard and language >> Change keyboard >> Add >> Expand the Russian and from Keyboard check the Russian.
Note: you can use Alt+shift to switch between keyboard languages.