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why won't my game work?

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ok so i got the sims 3 high end loft stuff and every time i try to load it, it says unable to start game error code 345. any idea why this is or how to fix it? i have sims 3,ambitions,late night and those all work fine so is it just to much sims EP stuff on my laptop or is it just the game it self or what? also my laptop is a hp intel pentium and windows 7. is it not compatable?