Windows may not recognize the partition, but it should still see the harddrive - Telling it to reformat I would think would cause it to delete the unknown partition and format it. Thats what I would try first.
Second would be to use the format command from cmd - again, it may not recognize the partition as a linux one, but you still should be able to delete the unknown and setup a windows compatable partition.
Thirdly, go to your harddrive's manufactur's website - download their low level format utility - fill the drive with zeros - format using windows.
Just make sure you are selecting the correct drive - would stink to go through all of this, only to realize you formated your windows drive lol
IcI
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