System Requirements For Windows: For Screensaver operation: Windows ME, 2000, XP, or 2003 Pentium class computer (500MHZ or greater recommended) 64MB or more RAM recommended 4MB free disk space

System Requirements For Macintosh: For Screensaver operation: Mac OS 9, Mac OS X 10.1, 10.2, 10.3, 10.4 ** (Mac OS 9.2, 10.3, or 10.4 recommended) PowerPC or Intel class computer (68K is not supported) 64MB of System RAM (96MB or more recommended) 4MB free disk space QuickTime 4 or later (QuickTime 6 recommended).

After you install Quicktime please do the following : Macintosh: Open System Preferences, click QuickTime, click the Advanced Tab, and check the "Enable Flash" checkbox.