ok,
for some reason it actually worked this time.
after about 28hours rendering time on my laptop for my 85min, it completed successfully.
this is what i did;
i firstly rendered my pics as a separate avi file.
then removed all of them and imported the avi. -still crashed!
then i pressed the remove all unused media button, to clean things up. Still crashed!
then i changed my DVD video rendering settings from 2 pass to 1 pass (to save rendering time) – still crashed!
then finally i read somewhere else about specifying my saving location of files. so i checked that little square at the rendering option page. and it WORKED! i think, because my hard drive is partitioned, i only had 5gig available on the C, although i had 20gig available on my E drive. so maybe my temp rendering files went to the C drive and not the E drive where i was saving my mpeg?
not sure if this is the reason, (as i kept all fx and remainder of pics in the film), but it WORKED!