Unfortunately, the official instructions won't do the trick. I can't open the Adobe uninstaller or do the de-registration, because I can only access my MacBook from my desktop computer as a peripheral in target disk mode. I tried opening up the CS4 installer CD on my desktop, but it doesn't recognize the MacBook as a destination disk or provide an uninstall option. As far as it's concerned PShop CS4 doesn't exist on my system. (I'm running CS5 on my desk top).

Would CleanApp work on a non-startup disk? Apparently Snow Leopard doesn't offer an archive and install option, so I have no clue what to do about the de-registration thing. Maybe I should just bite the bullet and take it to my local Apple dealer's repair shop & hope they've got an opening and a fix soon!

Many thanks to both of you for responding.