yea its me again with another problem 8)

when it renders a video, it stutters. it doesnt randomly stutter, it looks as if its missing frames, like when your using video confrencing over the net. ive tried rendering in MPEG and AVI and they both come out exactly the same. i went onto the official adobe website and looked in the support section and tried what they said (which was to make the rendering video frame rate, data rate etc the same as the videos you imported) and it doesnt make any difference.

is there a setting i need to change or something?