Reassigned scratch disk--now, PS won't open!!!

I have a Power Mac G4 (AGP) with two hard drives running Tiger. I installed CS4 and everything was fine until I started fiddling around in Photoshop and changed the scratch disk from disk 1 (10G start disk) to disk 2 (80G). All my applications are installed on disk 2 because it has more space. Now, I am unable to open Photoshop. Message reads, "Could not open a scratch file because the disk is not available."
I uninstalled and re-installed PS, but got the same message. I moved PS to disk 1, but same message persists and I am unable to open PS. If somehow I could open the program, I could change the scratch disk back to its original position. Can someone please help? Thank you for any assistance.
blooskeye

You will need to trash Photoshop's Prefs. because your current ones are designating a Scratch Disk that is no longer available.
Hold down Cmd Option Shift while launching Photoshp; and chose to "Delete Settings" when asked.
Once Photoshop has launched, reset your Prefs including the ones concerning the Scratch Disk.
>I moved PS to disk 1
That unfortunately was a major error.
You need to leave CS4 applications where they are installed by default.
You will now need to use the UN-Installer to uninstall CS4 and then re-install it from your DVD.

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