go pro camera help

[JARVIS518]

i need help with a few things

1 where do i find a free editing software? doesnt need to have any bells and whistles just want to be able to cut the video down to the action

2 when i watch the footage on the tv through the camera is runs great, nice and smooth, but when i upload it onto my computer its very choppy and unwatchable what can i do to fix this?

thanks in advance