Steam users/gamers, please help?

A month or so ago I bought a Tomb Raider Anniversary (for PC) on Steam. A few days ago I went on it and it said 'autosave failed' or something along those lines, and I lost all of my saved games, and when I started a new game, i could play it, but it still wouldn't save. Because I used Steam, is it... show more A month or so ago I bought a Tomb Raider Anniversary (for PC) on Steam. A few days ago I went on it and it said 'autosave failed' or something along those lines, and I lost all of my saved games, and when I started a new game, i could play it, but it still wouldn't save.
Because I used Steam, is it possible to re-install this game, or do I have to buy it again?
How can I fix this?
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