I had the same thing. Here's a way to do it.
1) go to Windows Movie Maker
2) under Imported media, import the video you want to burn to dvd
3) make sure that it is showing Timeline, not Storyboard at the bottom of
the screen. This can be switched under the View menu tab
4) drag the video into the timeline
5) right click on the video
6) pick effects
7) scroll down to 'Rotate 180' if the video is also backwards, click on
'Mirror, Vertical' as well
8) preview to make sure it works - save
9) close down WMM and open Windows DVD Maker - proceed as normal