i played an xvid avi (700 m) movie in windows media player of windows 7 in my toshiba satellite l40-18x laptop . and i found that every 5 minutes (about 5 or 4 minutes) the movie slow down and the picture freeze for about 20 seconds and then it continue normal playing and then after another 5 or 4 minutes it did that again and again and again till the movie ended . and this problem never happens with my windows xp in my desktop . i have windows 7 ultimate edition in my laptop . and i don't know what is the problem . is there something wrong with my hardware or with my software ( windows 7 or codac programs) . please help.