Thanks for your reply! Well, I got it to work with a slight difference from your method. Your method still would not change from Command Prompt to anything else. But, I went to the option to set default programs. I changed Wordpad to include .txt files as the default program. Then I closed Control panel and tried double click on a .txt file. It opened with Wordpad. Then I used your method to change Wordpad to Notepad and now it works properly.
Many thanks for pointing me in the right direction.
Jim