I bought my photoshop elements 10 box from Costco and I entered in the serial number for the first disk. Then, I removed the disk and put in the second one. I entered it in again, but it said that it was an invalid number. It worked on the first disk, but

It keeps saying that it is invalid for the second disk, but the first disk worked fine!

See if this sheds any light:
FAQ: Installing Elements 10, or What do all these disks do?

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