Photoshop CS2 says my serial number is invalid & will not run.

When starting photoshop CS2 I received a message that my photoshop user name, organization, or serial number is missing or invalid.  I cannot run photoshop.  I legally purchased it back in 2005 (I know, I've had this version for quite some time).  I used the program just a few days ago.  How do I resolve this?

I assume I am the Admin since I am the only user on this computer.
The Adobe CS Cleaner Tools says I have to uninstall CS program using the Control Panel>Programs>Uninstall.  I do not see the program.  Only Microsoft updates.  I searched their troubleshooting guide and found this:
http://windows.microsoft.com/en-us/windows-vista/troubleshoot-installing-or-uninstalling-p rograms I installed a program but I don't see it listed under Programs and Features. How do I uninstall it?
Only programs that were written for Windows will appear in Programs and Features. If you don't see the program listed and you want to uninstall the program, check the information that came with your program, or go to the manufacturer's website. Most programs install themselves in the C:\Program Files folder. Check this folder because some programs also include an uninstall program that you can try.
What is Photoshops uninstall program?  I haven't seen a file that could be that.
Can I use the CS cleaner program to uninstall Photoshop?

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