The forum you posted in here specifically serves Photoshop.com, an online site and service. For faster help with your issue, I urge you to repost your question in the forum for Photoshop CS: http://forums.adobe.com/community/photoshop/general
You can upgrade CS3 to CS6 but CS2 is too old to qualify.
You are a week too late to upgrade to CS5, which would have qualified you for a free upgrade to CS6.
If your need for upgrading is simply to be able to run on a modern system, recognize that CS2 runs fine on the latest version of Windows (with a minor trick to installing it). Mac users are not so lucky.
EDIT: Silly me. We're responding to an old post.