Uninstall

You must have partition your C:\ to NTFS.
Basically the easiest and quickiest way is to delete the partition.
The only problem is dos 5 or 6 does not recognize a ntfs partition. You can download and use a tool called DELPART to help delete the partition.
Once delete reboot to a Win98 startup disk and create a new partiton using fdisk.

Download here:
http://www.avitron.de/downloads/Tools_NT/Delpart/

Copy delpart to a floppy and run delpart after booting up the pc with a boot disk. Thenjust simply highlight c:\ and delete it.

Here also is a link to microsoft that should help you out.
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q103049