Make a copy of the original song, and use Wavepad to remove the bits you don't want then use the edited copy in Photostory.
A free version of Wavepad (for non -professional home use) can be downloaded from
http://funadvice.com/r/14sposscm38
Best wishes - Majikthise. .
computer fogot what it is its got photo go start then photo music
cut it with windows movie maker