Yesterday, I tried to start up Photoshop, but it got halfway through initializing and stopped, flashing a message: "Adobe Photoshop CS5.1 has stopped working." I shut down the computer and tried again, but it repeated three or four times.
So I uninstalled the program. Upon reinstallation, installation failed and the computer said: "Your installation encountered errors. Please try restarting your system and installing again. Exit Code: 20."
I've searched the Internet and discovered some others have encountered similar problems, but no solutions as yet.
You haven't even told you what platform you're on, Macintosh or Windows, let alone other details about your system.
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Thanks for all your help.
As I mentioned, I uninstalled and attempted to reinstall, but came up against Exit Code: 20. Apparently, I had entered the serial number slightly wrong--perhaps copying the colon when I copied it--and so, when I once again tried to install, I was more careful and succeeded.
That did the trick, reinstalling the program.
I'm sorry for not listing my specs. I'm on a Toshiba PC laptop running Windows 7. Again, thanks for springing into action for me!