by catchall
I use this:
Windows Movie Maker 6 (not the new version with Windows 7/8, as that has fewer useful features):
– Installing Windows Movie Maker 6.0 on Windows 7 or 8
And this guy’s FX pack to do Picture in Picture:
(Even after the trial officially ends, the FX pack still works.)
TUTORIAL
How to split screen or PIP with Windows Movie Maker
A quick little picture video showing how to create a split screen effect using all free programs on Windows Movie Maker. Can be done on Vista or XP.