NEED HELP Animate to AVI

! NEED HELP!
When you render the animation into an AVI JPEG or AVI RAW it says “can not open or start AVI movie file,” I hope you can help me!

I need Help.
Pleace Help me!

Is that when you start to render or when trying to playback the animation. If the latter what application. Why do you specifically want to render in this format.