When you purchase Photoshop and/or Premiere Elements 10 as a boxed product, you get a fair number of disks. The main reason for this is that a boxed product purchase of Elements is dual platform, that is, it's for both Windows and Macintosh.
When dealing with a Photoshop and Premiere Elements combo purchase, you get 5 disks. Here is what they all do:
When working with Photoshop Elements only, you have 3 disks. Here is what they do:
And finally, when using Premiere Elements only, you have 5 disks. Here is what they do: