Jim was the software installed on other computers but not uninstalled?

Uninstalling Photoshop reports back to Adobe as well as an install.

As long as the software has not been installed more than 3 times without an uninstall taking place the serial number works. Once a fourth install occurs without any uninstalls the serial number will not work until you contact Adobe.

This happened to me a few years ago when I installed on a new computer, the next day the hard drive failed. The store where I bought the machine replaced the computer but when I tried installing Photoshop the serial number was rejected. I had to call Adobe and they told me to uninstall the software and the serial number would work. It took about an hour before their rep understood that I could not uninstall because the machine was toast and was back at the store to be sent back to the manufacturer.