Hi!
Alternative 1
Boot a Windows NT CD or from the three NT floppies and start installation, when you come to the partitioning stage just remove all partitions and choose to exit install.
Alternative 2
Get the delpart utility found on a resource kit for windows 3.51 and only in that resource kit.
This resource kit can be downloaded from microsofts site.
I don't have the correct URL but search for it and you'll find it.
Alternative 3
If you have some old OS/2 disks boot on themand use FDISK that comes with OS2.
Alternative 4
Download the slackware color.gz, boot.img and rewrite.exe and make the two linux boot floppies and use linux fdisk which also can remove any partitions.
Alternative 5
Buy partition magic, great partitioning utility.
/Hasse