Not sure which version of Grub Puppy uses. If it's v1, type:
Code:
geany /boot/grub/menu.lst
in Console, edit, then save changes. If it's v2, it's a bit different. You'll need to remove the Windows boot script from
/etc/grub.d folder, edit
/etc/default/grub, then run
update-grub in console to set the changes in grub.cfg.