i just wanted to post the new link:
http://www.coniserver.net/coni_users/web_users/pirvu/au/demo/zips/litecnewton.zip...
something about the double precision dll came to my mind. i guess you have to change the dFloat typedef to double in the newton header. probably that's why it crashed.
and here is an interesting article about time slicing:
http://www.gaffer.org/game-physics/fix-your-timestep/(but you don't really need this with the current newton solver since unlike most other physics engines newton doesn't need a fixed timestep to be stable. maybe it could have some slight performance advantages though and reduce small inaccuracies at extreme frame rates. i am not sure.)