Windows Media Player (WMP) is the default video player on a PC. A "portrait" oriented video image must be rotated prior to being loaded into WMP or it will not display properly. Rotate the video image using the Windows Movie Maker program that is also included with the Window operating system. The procedure is straightforward and does not require any experience with how video works. The rotated video image can then be imported into WMP and played.
Launch the Windows Movie Maker program that is included with the Windows operating system by selecting it from the "Start," "All Applications" pop-up menu.
Drag the video file onto the icon of Windows Movie Maker--the icon is in the toolbar at the bottom right of the screen.
Drag the video out of the "Import" column on the program's main screen and into the "Timeline" column.
Select "Video Effects" from the "Tools" drop-down menu at the top of the program's screen. Drag the "Rotate 90" video effect icon that is now in a window beneath "Video Effects" onto the video that is in the "Timeline" column.
Click "Save Movie File" from the "File" drop-down menu. Rename the video file in the "Name" column at the top of the window that appears. Click the "Next" button on the window. Follow the menu prompts to save the rotated video file to the desktop. Quit the Movie Maker program.
Launch Windows Media Player by selecting it from the "Start," "All Applications" pop-up menu.
Select "File Open" from the "File" menu at the top of the program's main screen. Navigate to the desktop. Double click on the video file that was rotated and saved by the Movie Maker program.
Click the "Play" button at the bottom of the Window Media Player's video window to play the rotated video.