I took a movie on my Canon S90 still camera and I need to rotate & trim it to use in a sldeshow

DVDVideoSoft has a skew of free apps including one to Flip/Rotate videos. They come with ads of course but they do work well, and if this is a one time thing you can uninstall cleanly when done. They don't have maleware or virus's, and when installing you don't need any of their toobars.