So this is the firs time in all my years playing WoW that I have received this message. Well I had taken a small break from the game. Instead of downloading the game since my internet connection is quite slow, I decided to copy/paste the game from a friend's computer on my USB.

I have always played the game from a USB/External Hard-drive. However, today when trying to log in, I got that message.

Does anyone know what is up with it? I was looking for the "old" repair tool but couldn't find it. Also I tried a few different suggestions on the official forums where people experienced similar issues, like running it on administrator, uninstalling Anti-Virus software, and even deleting a few files in certain folders.

Nothing seems to be working yet.