lnsane

please help! i have windows 2000professional. everytime i try to watch a video on tube or anywhere for that matter, the video freezes after approx 2 seconds. if i watch videos the sounds plays and so does the video , but then it will freeze and even if i move the buffer along to any point it will just play for 2 seconds then stop. i have uninstalled flashplayer, audio drivers, checked sytem 32 . tried everything but i still cannot fix this irritating problem . please help