if you did it THROUGH win98, you have to select New Installation from the box that gives you the setup choices. Otherwise it will not format, or do anything with the partitions. As for unallocated space, if it is D:, then it's allocated. If you mean unused space, you'll have to resize the partition, but Windows XP setup can't do that. I personally don't have the Filesystem line in my setup. However, the only way that I know of with using a winnt.sif file, is to select Unalloated space. Not a partition, but unallocated space. Like Ryan said, to delete a partition, then create a new one and you'll get the dialog.