WINNT INSTALLTION

I HAD A HARD DISK OF 20 GB AND WANT TO INSTALL WIN-98 AND WINNT 4.0 SERVER ON THE SAME MACHINE, USING WHOLE DISK SPACE AND MAKING PARTITIONS OF 2.1 GB EACH.I AM ABLE TO INSTALL WIN-98 ,BUT AFTER THAT WHEN I INSTALL WIN-NT SERVER IT CRASHES. THEN I REMOVE ALL THE PARTITIONS AND LEAVING ONLY
ONE PRIMARY PARTITION OF 2.1 GB, AND WINNT WAS INSTALLED SUCCESSFULLY(SP3) AND CREATED NTFS 3 PARTITIONS OF AROUNG 5 GB EACH . BUT AFTER THAT WHEN I TRIED TO INSTALL OPTION PACK 4.0 IT GIVES ERROR COULD NOTDETECT OS TYPE. HOW CAN I MAKE THEM WORKABLE. BY MAKING ONLY FAT16 PARTITIONS OF 2.1 GB EACH.
TELL ALL THE STEPS ASSUMING THAT 20 GB HARD
DISK IS BLANK.