If the partition is on the one drive that you are going to reinstall Windows. Just pop in the disc and hit a key at the starting prompt when it says "Press key to boot from disc". Do a Fresh/Clean Install and you will have the option of formatting the harddrive and there is also an option to delete an existing partitions and reformat it into one partition again.
Since you are reinstalling anyways it is easier to wipe the slate clean.
If you are just trying to delete a partition without reinstalling Windows it becomes a little harder because of GRUB being in the MBR. You have to reinstall the MBR from the Windows disc and when you get back into Windows use a partition manager to delete the partition and re-add it to the Windows partition.
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