Downtown Dailies/blue studio

I have 2 ideas about the stuttering, which is happening to people I know, but not to me: one person has no (4 gb) of space left on his hard drive: I think that affects streaming playback. The other person has a 'live update' kind of virus protection constantly running: I can't see how a video stream can possibly play under this condition. I'm no geek, but I don't think the stuttering is all (or mostly) the vimeo guy's fault. Please correct me if my instincts are faulty!