Since 2 days ago i'm trying to log in in my account at MW2 to play, but i can't, after i run the shortcut at my desktop, an error appears and says that i have specified and incorrect username, he says to use the log in informations of the 4D1 forum to log in, but i'm using the correct informations, the username and password, is this forum account that is for my game, i can log in in forum but i can't log in in the game, can someone help me?

Are you using special chars?

No special characters i already try to change my account info's at the forum, here i can log in, but the game says that i'm using a incorrect username, but isn't D=

i Don't wanna start another account because i will lost everything i had done in this one already =/

I have 100% sure that i'm using the correct credentials