Delete Partition.

Method - 1

Step-1  Window Key + R (Open Run Box)

Step-2  Write diskpart.

Step-3  Write Select disk 0 or 1.

Step-4  Write list volume.

Step-5  Write select volume 3 or 4                  
            ( Partition number).


Step-6  Write delete partition.

Method - 2

Step-1  Right click on My Computer.

Step-2  Click Manage.

Step-3  Click Disk Management.

Step-4  Select Partition.

Step-5  Right Click on Partition.

Step-6  Click Delete Volume....