For any issue concerning Apple quicktime do the following:
1. Quit the program or the installer.
2. Go to Control Panel---> Add/Remove Programs--->uninstall quicktime (and anything else that is "Apple")
3. Go to www.quicktime.com and download a new QT 7.6.8 (or whatever is the lastest).
4. Install QT onto your computer.
5. Retry Starry Night.