Select in section "Source of image boot data" "Image file"
Navigate to your bootsector file using the "Browse?" button
Select "Enable Expert settings"
In the dropdown box "Kind of emulation" select "No
Change the "Numbers of loaded sectors" to "4"
ATTENTION! If you are using the original bootsector of
Microsoft Windows XP/2000/NT (NT5BOOT.BIN or NT4BOOT.BIN) go to the card "ISO". In section
"Relax ISO Restrictions" you ABSOLUTELY have to enable "Do not add the
';1' ISO file version extension". If you do not do this, you will get
the error 'CDBOOT: Couldn't find NTLDR' on startup. If your Nero
version does not have this option, use the modified bootsectors NT5BOOTM.BIN or NT4BOOTM.BIN.