When you launch the client you get like this :

This happens when you change Hardware, S.O , Network and others reasons.

So You need to reset your password  on this website:

1. Before the login (logout if you’re logged) click on “Lost your password”;
2. A mail will be sent to you, follow instructions and reset your password;
3. After your password have been resetted , then launch again the client (yourname.exe)

Any abuse gets ban!

AGAIN:

DONT YOU HAVE TO EDIT YOUR ACCOUNT.

-LOGOUT THE WEBSITE
-CLICK ON “LOST PASSWORD” -> My Account (not logged)
-SO after you have resetted (not changed) the password you can launch the client again.A mail will be sent to you.

IS EASY