First, download the VLC Media Player and install it properly on your computer.
Second, click on "File" and then on "Open" in the top navigation menu of the player. Run the movie file in the player to open. Click "OK" to open the file.
Third, the movie should be played immediately. If the movie does not play, the file may be corrupt or contain an error.
Right-click on the player window and select "Full Screen Mode" from the content menu.