CUPS, or the Common Unix Printing System, is designed for Unix/Linux. So using it in Windows may not work
properly.
A small Google search turned up a site like
http://www.owlfish.com/thoughts/wini...tml#permission
Maybe you can find some clues there.
Samba printer sharing may be an alternative solution as well.
However, I've already seen some printers shared as Postscript printers, so it may work with CUPS too.