Sometimes when you record something on your digital camcorder, you may flip the camera 90 degrees in order to get a better vertical view. However, when you do this, the video comes out sideways. This can be especially annoying if you were planning on exporting that video to a DVD or a media device. Thankfully most versions of Windows come with a program that makes it possible to rotate a WMV video and save the rotated version as a separate file.
Launch Windows Live Movie Maker. This program comes with most versions of Windows.
Drag the WMV file into the program window.
Click on "Rotate left 90" or "Rotate right 90" until the orientation of the video is correct.
Click on the blue icon in the top left side. In the drop-down list that appears, go to "Save Movie" and select the format you want to save it as. Name the file and click "OK" to save the file.