Problems with re-install of previously Activated Photoshop?

Question

Running Win Vista Home, w/ Adobe Photoshop CS...this is an older system.
If I turn ON the UAC in the Win Control Panel, and open Photoshop - it gives me an error message that I am not Authorized to use the SW (I am the only user of this PC and only installer of this SW license). 
If I try to Reinstall Photoshop, I get these messages:
"You're computer's configuration appears to have changed since this product was activated.  To continue using this product, Click OK
to activate it again for your system configuration, or Click Cancel to Exit." -
If I Click OK:
I get the Adobe Phone Activation screen, which is no longer supported. The Serial number, Activation Number, and Activation Type is displayed. (Activation Type REPAIR 24:24). What can I do about the Authorization Code?
Is there a manual work-around to this problem?  I do want to upgrade my PC at this time, but still need my Photoshop to work.

Answer 1

Uninstall your version of CS.
Adobe closed down the CS2 activation server a couple of years ago.
See Error: Activation Server Unavailable | CS2, Acrobat 7, Audition 3
You must now download the non-activation version of CS2 (it's OK for CS owners too) from the link above. Install then enter the new non-activation serial number provided at that link.
I've lost my key code for my CS2, is there another way to retrieve it?