The CS2 version of Photoshop is Power PC code only, It won't work with your new Intel Mac OSX 10.8.2
I found this:
Q. Will Adobe update Adobe Creative Suite , Studio 8, or individual applications, such as Photoshop CS, InDesign CS, Illustrator CS, Dreamweaver 8, Flash Professional 8, or After Effects 7.0, to be Universal applications?
A. No, Adobe does not plan to re-release current products as Universal applications that can run natively on both Intel- and PowerPC-based systems. This applies to Adobe Creative Suite 2 and Studio 8, as well as individual applications such as Photoshop CS2 . . . .
Thread is here: http://forums.adobe.com/message/4899065#4899065