Can't Start CF

I Cant Get On CF..Im On A New Computer With Windows 7 And Everything Downloaded, Updates And Stuff, But Game Watcher And Stuff Works Then I Get A Black Screen, And I Get "Client File Corrupted, Closing Game" So..Yeah Making Me Mad Lol Havnt Been Able To Play /: Any Solutions? Yes Ive Restarted My Computer, RELOADED Windows 7 Into It And Redownloaded CF 7 Times, (Bye Redownload I Mean Delete Everything,Even Directery, And Download)