Zend certified PHP/Magento developer

My video is playing upside down

Did some family wedding photography last week and thought I may as well set my iPhone up for the service as a surprise for her, stuck all the images and videos on the stick. Just edited all images and loaded them on a flash drive along with the video so she can view them on the TV. Plugged into TV to make sure all works for her, three of the vids are fine but the one of the service which is 25min long is upside down, up the right way on the pc though.

I have read the previous replies here and understand what the cause is and what needs to be done, however that is my first hurdle, I find it difficult to absorb and do tech things since my heart attacks unless I already know about it. My first question would be is it the master build of ffmpeg I need to download for windows as in the screen shot, and would anyone be so kind as to give me a step by step walkthrough on converting the video, or is the programme self explanatory? Worse case is she can still watch the video on her laptop but if possible i`d like to get it on the drive as she is coming Saturday to collect the stick.

screen shot