Iheartsyou

Okay i don't really know how to explain this..But i play a movie in Windows Media Player and it plays the audio first, then the picture..So like the words are way off from where the person is talking..Like first all i hear is like "hey, what's up?" then like a couple of seconds later i see that person move the lips..Sorry i don't know how to explain this, Help if you understand. Please. :}