on windows by using DISKPART, try to see, if you can change the attributes if disk or volume (there is an attribute READONLY), before you try to delete things.
HELP ATTRIBUTES DISK
HELP ATTRIBUTES VOLUME
ATTRIBUTES VOLUME CLEAR READONLY
ATTRIBUTES VOLUME CLEAR HIDDEN
(but windows is a bit like an idiot in things like filesystems and interpretation of diskformats)
on linux wipe the first few bytes:
sudo umount /dev/sdX*
sudo dd if=/dev/zero of=/dev/sdX bs=16M count=1
replace X with the letter of the SD card.
EDIT, what happens, when you copy the PINN-lite files to the first FAT partition? as far as i know, PINN-lite will repartition the SD card anyhow at its very first boot...