ee. help.

Okay, so last week i had to reboot my computer, and my photoshop doesn't work anymore.
I got a new version, and it says i can't install it until i uninstall my old version.

Well, I can't find out how to uninstall the old version I have. And I don't have the disk anymore.

How can I uninstall itt?

I had Photoshop CS2 if that helps any.

D: