Uninstalled nero7, nope, it went choppy too.
Uninstalled and re-installed my catalyst 7.7 drivers, nope, same problem.
I noticed that the aurorix listed as a WMP file runs smoothly. Those provided by windows dreamscene listed as movie clips (.mpg) are problematic on my pc. Perhaps i am missing a codec or something???
But ... i downloaded that necromancyInferno, a WMP dream file too, it ran choppily too ... what did i do wrong .. maybe i need to reinstall dreamscape

Thanks.