It is necessary to reinstall Photoshop Elements or Adobe Premiere Elements 7 for one of the following reasons:
- You had a trial version of the application installed, and you want to install the retail version.
- You receive the message "The serial number you entered is not valid."
- You have a site license or educational version of Photoshop Elements or Adobe Premiere Elements 7 installed. But you want to install the US retail version to enable Photoshop.com online services.