Hi deb,
Nancy won't run even if you double-click - it would really help for this part of the game, though! You can still move pretty fast if you quickly single-click.
Do you have a pail of water already waiting by the pump? That saves time.
Apparently there are two fires at this point - the shed fire, and a forest fire (which I never saw when I played the game). Are you sure you're heading in the right direction? From the water pump, turn left and head directly off up the path, the shed will eventually appear on your left.

and let us know if you still have problems.