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Sounds more like a video card problem to me.
Update your video card drivers. Graphic glitches are usually associated with bad drivers or a dead/dying card ... not corrupt game files ..
If an update does not work then maybe a complete uninstall and than a reinstall of the drivers will work.
Remember to restart the PC after each install / uninstall of your video card drivers to complete the process. Even if it doesn't tell you to do so.
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