Also, I forget where the thread was (and since you don't need it I won't bother to search for it) but I remember you originally had some difficulty editing the script to know where your calibre library is.
Not surprising, since I don't automatically expect people to be comfortable modifying python scripts.
But it underlines the fact that the script hardcoded the location of your calibre library -- which means moving the library breaks the script.
Sometime before the calibre update (I think) but after I gave you the script, I updated it to find the library using calibre's configuration -- no need to edit anything.
Now it is a moot point, since calibre includes the aforementioned option
but of course if someone was stuck on WinXP the script is still useful. (Wherever it is.)