If you use windows movie maker, it will give you options when you turn it into a movie, select best play on this computer and you won't have any troubles.
Don
If you want to let everyone see it, ie -family or whomever, when you save it to utube, they don't have to D/load it and you don't have to zip it, utube will convert it to thier format when you up load it so you don't have to worry about it.