WotLK Update/Login problem

[Mithhunter]

Hello guys! I have a problem. Once i type my account and password it starts downloading some update yet it stays on 0% download and in a few moments it says :
Patch required
Press the restart button below to exit World of Warcraft and download the patch.

I tried to delete the game and download the client again from the Download section and yet this problem still remains.
Thank you in advance.

[skullatbash]

you need to log in by using warmane account name, not email address

[Mithhunter]

Thank you!