the extensions are there, i even tried saving track under a different name and deleted all the box and models and it still gives me that error. I have a backup track that I made before I added anything to the track that still works so will just redo it all again.
Thanks for your suggestion.
also looks like I have to redo windows to get 1.5 to work, it gives me an error that I think is due to having Borland C++Builder 5 installed this time on my computer.
1.4 seems to work fine other than the above error on this one track.