That small screen problem, with video playback, can be down to your PC's graphic chip, or the drivers you have, or a screen setting in KM player. If you get full screen playback using Windows Media Player, then your graphics 'card' or chip is good enough, same for VLC player. Also, it can be the file you are playing is in a low resolution, and so the player keeps the window small on your screen, to keep the picture quality looking good, but small. You can usually drag the corner of the video player window out to a bigger size, but the quality will suffer, it's a compromise. Have a look in the options of KM player, for 'video' and option to change the screen size. Or play a video, and right-click in the window, you might see the options there. I will have a look at KMP and see how it works.