Ah Ok, this is an old script, and we never gotten around to optimizing it for Windows XP. I can't give you a timeline when the script will be looked at, as this is a 3rd party script, and our understanding of it is limited. It's possible the script may even be removed moving forward if we can't get it to function in modern setups.
In the meantime you might want to check out the last few scripts listed here for other Music related JavaScripts: http://www.javascriptkit.com/script/cutindex4.shtml