how do I transfere CS5 from an old computer to a new?

if you no longer need cs5 on your old computer, open one of the cs5 programs and click help>deactivate.

then use your cs5 installation files to install cs5 on your new computer.  use your serial number to activate.

if you no longer have your installation files, and if you follow all 7 steps, you can dl a trial here:  http://prodesigntools.com/adobe-cs5-5-direct-download-links.html

and activate with your serial.

if you have a problem dl'g, you didn't follow all 7 steps.  the most common error involves failing to meticulously follow steps 1,2 and/or 3 (which adds a cookie to your system enabling you to download the correct version from adobe.com).