problems opening Devil May Cry .mp4 video's

I'm having trouble opening the .mp4 versions of the Devil May Cry series on my computer. I keep getting Error 2002: Bad public atom whenever i try to open it with quicktime. I've been searching for 2 days to try and figure out how i can correct this but from what i can tell this was a problem involving VISTA but I'm still running XP on my computer and still having no luck getting them to work. if you have any suggestions as to how i can get these to work shoot me a message at yzkidjr@yahoo.com thanks!!!

*sigh*

CCCP Install this and use the players of either Zoomplayer or Media player classic (both of which come with CCCP and have tested to work)

That is all