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If you receive a Fatal Error from the ESO Launcher, you should run a repair on your game files.
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A video which details how to repair your ESO game files can be found here.
In addition, you can repair the files for The Elder Scrolls Online on your computer by following the steps below.
Once you have deleted the folder, download the ESO Launcher from your account management page here to reinstall it. You can do this by logging in to your account on our website and clicking the Download Game button on the page for your appropriate platform.
If you play on Steam, download a new copy of the game through Steam.