Video and sound dont match up? Like watching an old Kung-Fu movie.

[Portyansky]

First time that i am expriencing this. After I convert the movie back to a dvd format (using WinAvi) the voices and video dont match up. If i watch what i downloaded its fine, its only after i convert it, i am having this problem. How do i fix this problem

[Portyansky]

is there anyone that can help me. Thanks.