poz he intentado jugar al steam pero me dice k la cuenta es invalida y me han enviado esto:

Dear Steam user (account name: wirus1984),

This is an automated message generated by Steam account administration.

Your Dark Messiah CD-Key (the number printed on the CD case which you were asked
to type in after installing the game) has been found to be invalid.

The CD-Key you entered is: XXXX-XXXXX-XXXXX-XXXXX-XXXXX (Modificado por razones de seguridad)

You will not be able to play Dark Messiah unless you provide a valid CD-Key.

To provide a valid CD-Key, double-click on the name of the game in Steam's
"Games" window and then follow the given instructions.

For further help or product support, please visit
http://support.steampowered.com

Signed,

The Steam Support Team
To contact us, email steamsupport@support.steampowered.com


==============
This notification has been sent to the e-mail address you provided when you
created your Steam account. For information on Valve's privacy policy, please
visit http://www.valvesoftware.com/privacy.htm

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k he de hacer?

Tienes el juego original presupongo... de ser asi, y sabes ke estas introduciendo el serial correcto, debes contactar con ubisoft sobre este problema y decirles que ocurre. A raiz de ahi te diran a donde ir o con quien contactar. Normalmente lo que se hace es bloquear la key vieja y darte a ti una nueva, cuentanos que tal te ha ido.

k pone en el mensaje

A mi tambien me paso lo mismo en su dia, resulta que una linea vertical era una J. El problema me la soluciono el servicio tecnico de steam. Mirate este Link para contactar con ellos.