How to change menu language?

[Alli]

So I've managed to screw up my iTunes completely.

When I finally remembered iTunes Match, and that I'd paid for it, I realized I should install a version of iTunes that supported it...and got lazy. Somehow the version I installed is not in English, and I can't change it. I've tried reinstalling any of the other versions I have, and the menus are still in ?Polish?.

Anyone have any clue how I can fix this? I would be forever grateful.