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You can also reset your video/sound settings by deleting the following file:
World of Warcraft > WTF > Config.wtf
You can also clear your game's cached files, which may be corrupted, by deleting the following folder:
World of Warcraft > Cache > WDB
I'd suggest doing both of these things before running the repair tool (since it takes forever) or contacting Blizzard tech support.
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