If you had tackled that the moment it happened with System Restore then it may have been easy to deal with. But that option is gone and it's best to think over how this was enabled back then and repeat the procedure.
Bob
For years I have used my computer bilingually, in Hebrew and English. I change languages through the language bar, or with the alt+shift shortcut. Now for the last several months it will only type in English, even when the chosen language is Hebrew.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic