i need help... desperately.

I bought a Sony cyber shot to make a video for my friends wedding but most of the clips Ive captured are recorded sideways since I didnt realize it when I was capturing the video with the way i was holding the digital video camera. Now when I try to view the video ready to edit, the clips comes out sideways and I need to tilt my head sideways to see the clip properly!

Help!! I have a ton of people waiting for this wedding video... I need help... please.

The video format is a MP4 quick time player

What sort of program can I use to rotate the video clip?

PLEASE help :!: :!: [/b]