Combined Community Codec with Windows Media Player, Handbrake works well with changing the formats. The free GoPro software from their site works well for putting stuff together. If you are doing a lot of this just get a MAC, it a lot easier on a mac. I use iMovie and Handbrake for all of my videos (Go Pro HD and my Sony HD Handycam). I am new to Mac, but I can do the work in a third of the time on a Mac compared to PC.