Wonderful Problems with the Downloader

[Ruvanal]

Edit: I found this bit of sage advice, but have no way of verifying other than to try it:
Just deleteing the "Interface" folder in your c:/worlds of Warcraft dir will remove it.
-MB

If you feel uncomfortable with jus deleting it, then just rename the folder to something-else and the game willnot see it to use. You could then change the folder name back if you needed to. But just deleting should work fine as the game can regenerate an interface folder if needed later.