Whenever I take a video using my iPhone 4 and then transfer it to my computer, the video is sideways. I want to flip it so it is upright but I don't know how to do it. Is there any way to do this and how?
If you are a Windows user you can use Windows Live Movie Maker. You can download it for free from Windows Live Essentials. Its a snap to use and rotate a video.
If you are a Mac user you can use iMovie. Use the Help to learn how to Import the movie, rotate and then export it.
The more basis question here is why are your movies rotated? Usually it is caused by starting a movie before the screen has detected the orientation (portrait or landscape). Try making sure your phone is in the orientation desired before changing the switch to Movie and see if that helps.