Are using exactly the same login as you used on the website to buy the game? Also, if you go to your User Control Panel, and click 'Automation' on the left, does it say something like "You have purchased the following keys"?
Your forum name should display either Naturally Aspirated, or Supercharged/Turbocharged, and your name doesn't have either on those. Are you sure you purchased? If so send an email to
contact@camshaftsoftware.com and let then know your forum name, and the email address you bought the game with.
Also, this is the proper place to go if you're having account/login problems

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viewtopic.php?f=16&t=917