Cannot open package when installing new software

Dumb question but when I try to install an application using an installing file I am getting a message along the lines of "Cannot find the application to open file XXX", where XXX is the package referenced by the install file, in this case Photoshop Elements 3 for the Mac. The disk image in which the installation file is contained is created through a DMG file and looks fine.
Help?

Have you tried with with any other applications your trying to install. I know PSE3 is pretty particular about being installed from the disc.
When I've ever tried to replace it from a backup I've always needed to install it from the disc otherwise it just won't run. Perhaps it has similar issues with installing from a DMG.

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