How do I add sound to a homemade VIDEO made with digital camera?

I use picasa and the option to make a movie is great. However, I want to add background music of my own from MP3 or other music to the movie I created. What can I do with XP? Is there a simple freeware software out there?

try windows movie maker...
Start > All programs > Accessories > window movie maker

File > Import (import the video ) then drag the seens in the correct order to the time line

File > Import (import the music) then drag the music to the timeline.

I hope that works and i hope u like it

You need some kind of video editor. For free version, you can try MS Movie Maker. You can go to Microsoft.com to download it. If you are XP user, it is free with Windows.

Not freeware that I am aware of. I use Pinnacle Studio 9 which is excellent for editing and dubbing music...

XP already includes the necessary software. It's called Movie Maker.