Some great ideas!!
I ran the tests as suggested. All computers can play them right side up IF I shoot the movies with the home button on my right. Then I tried loading Quick Time on the PC's and found that with that software, it will play right side up no matter how I shoot them. It is just Windows Media Player that plays them upside down if I shoot the .MOV with the home button on the left. Problem solved!!! I did not want to abandon these movies because they cannot be re-shot; they were at a one time event. Now with Quick Time, all is good. I figure someone out there will point me to a free or low-cost editor so I can flip the videos shot incorrectly and re-save them. If anyone knows of software like this, please do tell!!