I google a solution for my video playback problem. But still i could not fix it. So, if you kinds please help me i would be very grateful. At first my window media player played .wmv file with blank but sound was there. And I tried to fix it but i couldn't. So i just formatted my pc and installed window; hope that it would be ok . But it's not. Rather another problem came. When i played .wmv , avi or others video and sound is choppy or breezed. But when i took the video to external drive and played, it is OK? * So what problem is this? * And How can i fix this?