i have a problem D8

[ah_anime18]

so ive been using my webcam thats inside my laptop and the first video I made was just for lulz and the sound was in sync with the video, and now, every single video ive made after that...the sound is waaaaay late and isnt in sync

i havent changed any of the settings
does anyone else know wtf is going on?

i need it fixed so i can make vids
*cries*

edit: btw, i have windows vista lol