Problem LOADING FILE. File plays before loding is complete

Hi , I have a problem to which i am struggling since last 2 weeks.
I am new to the actionscripting thingy. So dont understand much.
my problem is explained as follows.

I have a “loader.swf” after which my “main.swf” loades. I have used a loaderPro v3 (AS2) component. Doing that was easy but then when it starts loading, even before the loading completes the main.swf starts playing in the background. And i have no coding in my actions panel.
I know this sounds lame . But really would appreciate some help here .

some details if needed.
project stage size 960px X 600px
Flash cs3
Actionscript 2.