If the system is 64bit, then the problem is the 32bit codec used to compress the video and/or needed by P8 (which is a 32bit app).  If you can afford the extra RAM overhead, try loading the AVI into a video editor and save it out (use a different name!) as an uncompressed AVI.  Then try the uncompressed AVI in the movie node.

Oh, the node layout shown is for the special case of wanting a movie to start in frame 31, play for thirty frames, and then stop.  All you likely need is plug the movie node into the diffuse channel, or if it is supposed to be luminous, like pixie dust or a TV screen, plug it into the ambient channel.  I simply didn't have a simple movie setup in my Photobucket album.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5