Photoshop CS2 installation issue

I had to clone my hard drive, and then CS2 didn't work anymore. I downloaded the individual programs from http://www.adobe.com/downloads/cs2_downloads/index.html, and they installed and ran OK except for Photoshop. At the end of the install I got this error message: "Error 1402.Could not open key: HKEY_LOCAL_MACHINE\SOFTWARE\...Adobe Photoshop CS2 - {236BB7C4-4419-42FD-0409-1E257A25E34D}. Verify that you have sufficient access to that key, or contact your support personnel." I tried it as the administrator, etc., but I keep getting this message. What can I do?