From Adobe's website ...
"Adobe has disabled the activation server for CS2 products, including Acrobat 7, because of a technical issue. These products were released more than seven years ago, do not run on many modern operating systems, and are no longer supported.
Adobe strongly advises against running unsupported and outdated software. The serial numbers below should only be used by customers who legitimately purchased CS2 or Acrobat 7 and need to maintain their current use of these products."
http://www.adobe.com/downloads/cs2_downloads/index.html
