Hi, this is probably really easy to answer, but I just got Viva Pinata for the PC, and when i play it it says I need a Windows Live Gamertag if i want to get achievements. I know that a Microsoft Live account can be associated with an existing Xbox Live gamertag, but...how do I do this, and for that matter, how do I sign in so it registers it on the game? as when i go to create a microsoft one, I have to make a new one, is the ummm....."melding" of the accounts done after this?