Query on fitting Music

Under the Project Tab in Movie Maker, the sub-tab "Fit to Music"  appears blurred and thus fitting music to a movie is not possible.

I was making a short movie of about 8 minutes from an original 60 minute movie. I edited the 60 min movie to the reqd 8 minute movie and saved it separately.

When I played the edited movie. I noticed that the video lagged the audio appreciably.

I then tried to match the video and the audio by separately saving the audio again and trying to use the Project-Fit to Music Option to synchronize audio and video of the 8 minute movie 

Please let me know how to fix the problem.

Thanks

evkrish