movie maker play speed

Hi. I'm in the process of creating a movie, using video that I imported from
my video camera. I'm finding that the replay speed of the movie has
increased, such that the audio and voices in the movie are harder to
understand and higher pitched. I know this can be a complicated issue to
deal with - is there anything I can do to slow down the replay speed, short
of using "half speed" effect, which goes too far in the other direction?

Thanks very much in advance!!!