Step 1
Go to this website http://www.online-convert.com/
Step 2
Click here
Where to click (Click to Show)
Step 3
Select either MP4 or AVI (my preferred choices)
Selection things (Click to Show)
Step 4
Now it says you can't convert gifs or pictures to video, but you really can. Import the file you want to convert
Import (Click to Show)
Step 5
IMPORTANT
Set the frame rate to what you had it in pivot, because GIF's move faster than they do in pivot. If you animated it at 24 fps, set it to 24 because it will move faster if you don't set it.
FPS Changer (Click to Show)
Step 6
Now that you have all this done, you can now convert it! The button to convert it is at the bottom of the Optional Settings
Step 7
After you have the new video, go into Windows Movie Maker or some other editing software where you can add sound, and there you have it! You have added sound to your GIF... kinda?
if you have another method then good for you, made this for the people who dont know how.