When I install Adobe Photoshop CS3,I get this error:

We are very sorry, but an internal error occurred.
Please re-install the program to fix the problem

Error-Code: 1 / -3 / 9000

See doc#5305

Here is a page on Adobe's Support forum suggesting a troubleshooting approach:
Error: "Some problems occurred during installation," "Component install failed," or "Shared components failed to install" (Adobe Creative Suite 3)

Here is a link to Adobe's own support forum(s) where I am sure you will get speedier feedback:
Adobe Creative Suites - User to User Forums