I try to make sure nothing else is running during that process. I do not have antivirus or email running. Sometimes an internet browser is open but not usually. I thought I had the problem solved yesterday because although the problem persisted after uninstall/reinstall, I had to redo the video production in its entirety and it worked like a charm. Now, though, the problem has started again using a different video production.
I have a solid state hard drive, and I did try a defrag just the same to start off with.