Ok, we'll clear this up with Launcher errors. When the launcher starts, it looks for 3 files: Wow.exe and 2 item caches.
Now, the place it looks for Wow.exe is the same folder as itself. So if your Wow.exe is located at C:\Games\World of Warcraft\Wow.exe, then you must put the launcher file into C:\Games\World of Warcraft\
It looks for the item caches in /(WoW folder)/Cache/ADB/(your locale)/, where (your locale) is something like enUS or enGB. There should be 2 files in there: Item and Item-sparse.
If any of those errors are appearing, please check that the launcher is in the same folder as WoW.exe (NOT the same place as the shortcut on your desktop). Also check that those item files exist in /Cache/