how many files have you tried? baka naman yung video file mismo ang may problema, baka out of sync talaga yung video
give and example of a file you tried to play and check its encoding info. it might na mali ang gamit mong codec. OR naka battery mode ang laptop mo while you are watching it. sa laptop ko na very high end, even simple tasks like now (typing dito sa forum), while a game is running and on battery mode, nagkakaron ng delay, the same holds true for doing any process that requires a lot of resources, magkakaron ng delay since naka battery mode. in which case, plug it in to improve performance