MICKMCQ My problem was a blank license agreement, and the following error message when I clicked agree. "The iTunes application could not be opened. There is not enough memory." I googled that error and tried every solution I found. Finally, I heeded a suggestion to look at /Applications/Utilities/Console, where I found that I was loading the Digidesign CoreAudio Plugin, even though I stopped using DigiDesign hardware months ago. I found the uninstall procedure at the Digidesign website. (the procedure is to remove it from Library/Audio/Plug-Ins/HAL) Since the driver was still loaded, I restarted. I started iTunes immediately after rebooting and the license agreement looked normal, and clicking agree started iTunes normally.
(Version 6.0.2)