I have been running PS 4 for a couple of years without problems. A few days ago, when opened the program I got a message to check to see that I have the latest driver for my video card. I have subsequently updated that driver. When I cleared that message and opened a photo file, the file would open, then I would get a message that, "CS4 has stopped working." I finally got rid of the update driver problem, however, I still get the CS4 stopped working message and the program shuts down. I have uninstalled and reistalled the program twice and updated to CS4 11.0.2, none of which has solved the problem. I run Windows 7.