so you are getting the error message while installing the CS4 ?
I searched the internet and found the
problem. I had to go to C/Program Files/Common
Files/Adobe and in the backup folder, I removed
the CAPS File. The way Adobe has changed the
support area is not very user friendly. If I
could have been able to call and talked to
someone for 3 minutes, I would have been up and running much sooner.