fedora core installstion will bring you to a partition manager in setup. You probably wont need to format anything, just select the 98 partition and hit next, it should prompt you if you would like to format it or keep all partitions in tact select keep all intact. What this will do is tell grub to show a selection when you boot, the selection would be 98 or Fedora Core 4 select either one and either one should boot ive done this with Fedora Core 3 and Windows 2000