Just to add to DarthStoney's observations the script relates that one of three conditionals must be met:
if( bAllowPlayback &&
( ( nPCAlign >= 75 ) ||
( nPCAlign <= 25 ) ||
( nDarkPoints + nLightPoints >= 50 ) ) )
This means that the player must have an alignment of either 25 or 75, or have made 50 lightside and dark side choices. The code that actually controls when the movie plays is as follows:
if( GetGlobalNumber( "000_Event_Movie" ) == 0 )
So in other words either you need to change the Global Number name that the file refers to, or remove the script entirely.