I can understand that. But Will your Install Do a good job of creating a new partition? I'm not familiar with what They use for It, If nothing else, Might I suggest Partition Magic?
Do you still have the Windows OS CD? If so, and It doesn't work, you can always try It and If doesn't work, Run F-disk, and Format the whole Drive, then Create Two partitions.
This is what I did awhile back when I wanted Win 98 and Xp both on my system. I of course had installed Win 98 first, and Xp Picked It right up.
I think theres also an Article at the Old Tech TV site. I'll try and Find It for you today, and Let you know.
Stephen