Hi, Got a XBox 360 for my son and set it up but did not at that time setup the XBox live account through the console. Have now today setup an Xbox Live account in his name online with our PC. But now when we go to the XBox live section of the console it asks us to Join rather than Sign in. When I enter the account details we just setup it tells us this is already used and choose another. How can I log onto our Xbox Live account via the console.