I cant log in in MoP.

Hello.
Im new in the server.
Yesterday i have a problem when im playing. My antivirus delete the wow.exe file. I have to download the whole game again. When i enter the MoP says "The information is no valid, please contact blablablabla..". The realmlist is correct in the WTF file.
Please help me.
Thanks.

Are you logging in with your username? and not ur email?

did you download the Client from Warmame?

thanks for the worry guys, i solve it. I was use a wrong user name XD.