I then booted Windows Vista. Looking at the flash drive, I noted that there was /boot/isolinux directory created by the Knoppix (CD boot) Flash Installer!
I think, this can only happens, if you have not partioned your stick once again after your attempt with "dd". The script "flash-knoppix ask you:
Code:
Repartition and format device?
CAUTION: All data will be erased!
No = Exit program"

Do you really want to do this?
WARNING: ALL DATA ON WILL BE ERASED!"
If you really select "repartition", the script creates '/boot/syslinux' and not '/boot/isolinux' for the flash device and also the file 'ldlinux.sys'.

Please check
Code:
Microknoppix:~$ md5sum /usr/bin/flash-knoppix 
5b534dc8f5376a2d4b5dcf82727ef6ff  /usr/bin/flash-knoppix