Gerry, i don't think todays canon cameras shows up as removable drives in windows, i can't imagine your does ? Sure it is an icon in windows explorer /my computer, but it doesn't have a drive letter and you can't see the folders CHDK, 100CANON, DCIM, etc that are on the card.
I believe many modern cameras use another method and does not act as removable drives as USB-sticks, MP3 players that do get a drive letter.
Abuseddog, i think you should read more on the links Gerry posted, you get all extras using chdk own menus wich are accessed using the print button (not sure on a570 though..)