My initial attempt to install Adobe CS2 onto Windows 7 64-bit (hereafter W764) was unsuccessful. W764 has two program folders:  “Program files” and “Program files (x64)”.

By default the installer will try to install into “Program files (x64)” and the unsupported characters “( )” make the path void. I changed this to the other “Program files” folder and continued the installation.

However, upon starting the programs, I was met with a “Your adobe photoshop user name, organisation, or serial number is missing or invalid” kind of error and the application quits automatically. Checking registry editor showed that there was indeed an issue with the installation paths.

Searching the problem on Google gave me the solution. The application must be installed into the “Program files (x64)” folder or it will not work. To do this, the path must be changed to:
C:\progra~2\adobe
in the  installation destination.