Movie maker playback and DVD burning trouble

I'm having problems playing back and burning movies created in movie maker
when I add too many transictions or jpegs. This does not seem to make sense
because the movie is only 55 min long and 5.5MB.
In some cases I have problems burning the movies and I get an "unspecified
error" once again this seems to be dependent on movie size (even though the
these have not been greater than 5.5 MB)
I would greatly appreciate help on trying to resolve this issue.
THank you!!