Rotate Video (MOV format)

I have some videos I took with my camera but some of the videos at some point of playback are rotated. When I took the videos, I was moving my Olympus C7000 camera sideways, the way I take some photos. However, the digital screen display shows me what I see but the camera recorded some videos sideways. Now not the whole video. In one vid I was recording holding the camrea the normal way, then I tilt it sideways for a minute, and back to normal.
What editing software, Nero, Roxio, something, would fix this for me?
Thanks.