Help with Digicam Video Needed!

[GardenStateGirlie]

I filmed a bit of Wednesday's show with my camera held vertically and thusly, La Nicks is sideways. I was unable to flip the footage with Windows Movie Maker and as far as I know, there are no other movie editing programs that came with my computer. Anyone know of a good program I can download for free to flip the footage and then save? (because with many of these trials, you're unable to save). Any help would be appreciated! Thanks!