Yes, you have to uninstall one of your Olympus DSS Player Standard application. For this purpose, navigate to Start > Control Panel > Uninstall a program, select the software from the list and click Uninstall. Follow the on-screen instructions and reboot the computer when the process is complete. After that, install again the software using the new serial number. If you have issues, use the contact form from the official web page to get in touch with the developer.