Pier

Hello, I play the game for about 3 months now an i never had a problem, but yesterday when I wanted to log in the game. This message appear, Need a battle.net account..bla..bla..bla. I check on the forum and i did every things i can do, i delete the folders, etc, i also delete the game 2 times and reinstall it and nothing. Can some one help me plz ? No my account is not banned or muted Thank YOu