Step 1. Press the "Windows + R" keys at the same time to open the "Run" Dialogue. Then type "diskpart" in it and press "Enter".
Step 2. Type "list disk" and hit "Enter": display a list of the disks currently connected to your computer.
Step 3. Type "select disk" and press "Enter": select right the disk containing the partition that you wish to delete.
Step 4. Type "list partition" and press "Enter": see all the partitions available on the selected disk.
Step 5. Type "select partition" and press "Enter": identify the one that you wish to delete from the partition list.
Step 6. Type "delete partition override" and press "Enter": force delete the selected partition with using the override parameter.
Once the process completes successfully, type the "exit" command and press "Enter" to exit Diskpart.