QuickTime for Windows is required for operation of this product. QuickTime for Windows version 2.1.1 is provided on this disc. If you do not already have QuickTime for Windows installed on your PC, you may do so now. If you have an older version of QuickTime for Windows, we recommend upgrading to 2.1.1. You have the option of deleting the old version. This is recommended by Apple, but is not necessary.