Lefty, the IDE will not open. After the second message it simply exits. However, I did some searching and I found that in the folder Users\<user name>\appdata\roaming there is a folder called Arduino and there is where the preferences.txt file is stored. I simply edited the file to point to the correct folder location and problem solved. The IDE now runs and I am able to once again work on my project
Good Idea! I have to make a note of that because I am going to be working on different projects also. I am sort of a newbie at the Arduino level, but about thirty some years ago I used to work in R&D and breadboarding was my bread and butter. Back then, though, everything was discrete, we were just beginning to see microprocessors come into being. I used to work with the Intel 8080 and Motorola 6400 (I am dating myself). But to do what you can do with a microcontroller like the Arduino, it took a 10" x 10" circuit board full of chips! Amazing! I am just now getting back into this because of my 16 year-old daughter, who is really into Robotics and STEM subjects.Thanks for your help!