at first when i got morrowind it crashed everytime i got the veryfirst quest in sayda neen when i wanted to walk out of the censors office *pretty ****y*
then i updated my sys to 512mbram

and gf4 with 128mb

and see it works
next than it sometimes crashed without a reason, till 1.2 came out NO CRASHES ever
then tribunal and bloodmoon came and it crashes sometimes in the middle of a cell not when loading

quite frequently or i can play hours and shut the system off correctly
status now:*quote*
I have experianced the same thing and i cant seem to fix it.
Randomly and sometimes very ofter, the game crashes back to my desktop. This always happens at the worst times; for example in heated battles or as I finish a hard quest*quote*