Can't log on to TBC servers (game files missing?)

I was able to launch the game, log in and select the server, then I got this message:

Your account is authorized for the burning crusade expansion, but the computer you are playing on does not contain burning crusade data. To play on this machine with this account, you must install the burning crusade. additional data is available at: www.wow-europe.com/en/burningcrusade/download/

I have already reinstalled once and I dont know of any other solutions to try.

PS. I won't be able to respond to this topic for about 10 hours.