According to the stickied Win7 thread in Glitches:
You must edit the Scream.CFG file. To accomplish this in Windows 7, go to C:/Program Files/Nucleosys/Scratches. Find the Scream.CFG file and right click. Select Properties and from within that window, change the Open With option to either Notepad or Word Pad. Change the Rate from 0 to 60. Save the file, exit and restart the game.
But I'd suggest trying it as is first, without tinkering, to see if the BigFish version has taken Win7 into consideration (it doesn't look like it).
"Bleat, Watson -- unmitigated bleat!" ~ Sherlock Holmes