As Jim noted, you will need to install from the link he provided because you apparently have a v1.0 CD which was not valid for Vista, only XP. Your retail product key can be used to activate after you install from the web site. My recommendation is to leave it in trial mode for a bit as you can get up to 90 days before you must activate your subscription. If you already have a subscription, activate right away. A new subscription begins as soon as you activate on the first PC.
-steve