Hi you guys, thanks for all the suggestions. I tried them all. And to bplus and tempodi, as owner of the Brooklyn Bridge and part owner of the Eiffel Tower, I am not a gullible person.
The "permissions" seemed to be set exactly the same when I compared both Settings in my computer and Settings in each of the programs via the "Properties". The only thing which changed, was that I had created a new file to accept the transfer of the program, so I deleted everything that was transfered to the C drive and started over. This time with a straight copy from the USB stick to the C drive and voila, the error no longer appears when I run the program from the C drive.
I'm still not sure why the IDE mode error was corrected. Thanks again for the help - this solution reminds me of that wise IT advice "Well did you turn it off and on again?"