You cannot convert from NTFS to FAT32 you can only convert from FAT32 to NTFS and
that is not a good idea anyway. You definitely can't run '98 on an NTFS drive.
Looks like you are into formatting and setting up a second Primary DOS drive, etc.
on the second drive.
Or it is an older or second hand machine for '98.
Dual booting has to many problems.