CS3 stopped working, now won't install
I've been using CS3 Design Premium on Windows 7 Pro, 64 bit, for years. Yesterday, I tried to open Photoshop and got an error message, I think it said that the application was damaged and would have to be reinstalled. First I tried repairing the installation. That didn't help. So I uninstalled and tried to reinstall.
Acrobat 8 Pro will install, but nothing else will. I have tried the installation many, many times. I have the DVD, the serial number, everything I need. I have also tried downloading new install files from the Adobe website, but those also failed.
I have looked on line for solutions and found nothing. I also have not found clear troubleshooting steps. Please help.