Thank you for your response. I did as you directed. It said "No Value Set". I entered the value that you gave me, rebooted the computer, and tried to open a file. I still get the same error message. I attached a screen capture of the error message just in case that might be of any assistance.
I forgot to mention, it did help though. I can make new files. So that is great progress. The only thing that I am unable to do is open an existing file by double clicking on it. Thank you for your help.