Thank you again for all the help and suggestions you offered regarding my problem with Photoshop. I can't explain it and I don't know why, but after being away from my computer for a couple of days, I brought up Photoshop today and it worked fine. Every file I clicked on opened right away. Before that, I had already turned Photoshop and my computer off and then restarted everything, in case the problem was minor... no luck. Why Photoshop decided to work today when I opened it is more that I can understand. At any rate, the software is working fine now - thanks once more for taking the time to help me with the problem.
All the best - and Happy Holidays!