Hello. I've recently installed Windows Xp on my laptop and the default media software was an ugly old version of windows media player so I installed KMPlayer instead but it was very slow so I unistalled it. Now after I made some software updates on my laptop I am using the windows media player 11 I think ( a new version). The problem is that I can't play video files. Every video has Type of file : KMPlayer.mp4 . When I click on a video file it says: Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.