I will say that Windows is usually the source of these kinds of problems. Its a bad platform for games and is unstable in general. If it was working fine and then suddenly stopped operating properly then its usually to do with something buried inside windows that was somehow changed. If you are determined to play this game you could try and reformat your computer and reinstall windows. But to begin with cleaning out your registry and overall optimizing your system is advisable. If you do reformat the whole thing and the problem persists then you can know it was not related to your system while if it works fine thenyou'll know something went awry in the works.
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