I have PowerDVD 9 installed in my computer, but when I select Movie Player from PowerStarter it only launch PowerDVD 8.

The previous version of PowerStarter can only launch PowerDVD 8. This issue has been resolved and the update is available. Please download the latest update from the link below:
https://www.cyberlink.com/support/cyberlink-dvd-suite/patches_en_US.html
After you install the update, you are able to launch PowerDVD 9 from PowerStarter.