League un-installing itself.

Sorry if this is in the wrong topic but basically league of legends un-installs itself every so often. It will be fine for a couple weeks then 1 day its just uninstalled and its annoying. I have no clue what would be doing this (the game itself or anti virus are my 2 guesses) so any help would be appreciated. I play on windows vista and my computers a little old. Thanks.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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