Anit aliasing takes a higher resolution signal, such as that from your computer, and removes the signals that cannot be displayed properly on a lower resolution medium (your hdtv) before rendering them to minimize distortion, and thus provide a better picture.
My only idea is that your television is having trouble identifying the resolution, and how to display it properly without anti-aliasing, when you launch the game because of the excess signal beyond the scope of the television capability.
Why it works fine under a different account is beyond me without a similar setup to experiment with. Ensure that there isn't any resolution difference between the admin account and the account that you cannot play the game with without antialiasing on. There has to be a difference in settings between the two to account for the difference, which should help you avoid such problems in the future.
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