Can't LOG in

ok,so this is what is happening,i can stay logged on as long as i want but when i go to log off and log back in i cant log in and get the dc error

Edit-its non-hamachi and it was doing this b4 it was non-hamachi any ideas?

Maybe U edited Something Wrong? Or One Of Your Programs Is Corrupted Maybe?

hmm,no not the configs, :\.....any ideas??