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How To Add and Enable Additional Languages in Windows
How to change keyboard language in Windows

I hope you are using standard qwerty-йцукен keyboard
If you are talking about "и" then it's located on "b" key
The letter "е" is on "t"
If you are talking about "ё" then you might want to punch...

for "serious typers" - http://www.kniga.com/books/depts.asp?dept%5Fid=1020
:)