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If you wish to uninstall elements just open your finder and browse to the Utilities, Adobe Installers, Adobe Photoshop Elements 6 folder and run the Uninstaller.
Then once you are done run the CS3 cleanup tool which will remove any residual files http://www.adobe.com/support/contact/cs3clean.html
After all of that empty the trash, Reboot and reinstall.
Let us know if you have any problems.