my audio is too fast and my video plays too slow, help pls!

[drunkenskillz]

hi i just recently got the bs player and my friend suggested it to me. whenever id go watch movies at his house it would play perfectly but when i installed it sometimes the audio is too fast and the video is way to slow, they dont play at the same time is there any way i can fix this? i tried the decoder and encoder but nothing seems to work please help me.