Help! Blizzard!

Today, i opened WoW : WoTLK regularly, like i do, and when i open, it just goes to the opening screen to type my account name, password, but today that's not what happened, when i opened the game, it showed me (BLIZZARD ENTERTAINMENT) written in gold, and then went to the opening screen, but showed me things that a person who still is going to play the game, (Copyrights and things to read), and the screen got smaller, and the game got smoother, and when i joined my lvl 80 character, there was no (Joined Channel : 1-General : Stormwind City) neither the other 3 channels, and when i type something in the chat, it only appears as a bubble on me, not as (Character says: ...........) in chat, need help please! Oh, and also there was no gearscore to anything i wore or seen, or even characters playing with me!

lol delete WTF folder

And the game will be back again?

The WTF file has the characters, the ones that existed and ones that are still existing...