I'm not sure if it is still available, but Adobe was giving away CS2 licenses earlier this year. The site isn't loading for me right now, so I can't confirm, but you can try checking later. And if that offer is no longer on, you can also grab Gimp from
http://www.gimp.org/ which will let you do the same kinds of things for the most part, and its free and open source code.
So no excuses!
Edit: From Adobe's website: "Adobe strongly advises against running unsupported and outdated software. The serial numbers provided as a part of the download may only be used by customers who legitimately purchased CS2 or Acrobat 7 and need to maintain their current use of these products."
Sorry, but I guess that means no CS2. Gimp will still work fine though.