Now I can't play the game anymore even downloading it again
This means that they've left a save file somewhere in your computer. So it's taking up space, bloating your computer without you being able to easily find it.
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Well, when I deleted the folder in local low, it seemed to reset the game. So that's how I found it. About the space thing, when your trying to clear up space, getting rid of big things is easy, but when you have a mass of tiny files that have accumulated over the years it can be a real headach. You don't want to accidentally deleat something important.