Maintenance for the week of January 12:
• [COMPLETE] ESO Store and Account System for maintenance – January 13, 9:00AM EST (14:00 UTC) - 12:00PM EST (17:00 UTC)
• ESO Store and Account System for maintenance – January 14, 9:00AM EST (14:00 UTC) - 12:00PM EST (17:00 UTC)
You can try to resolve this specific issue by deleting the ShaderCache.cooked file which can be found in the game documents folder. The default location for the file is C:\Users\*USERNAME*\My Documents\Elder Scrolls Online\live. After that file is deleted, run the game as administrator, and it will recompile that file.