Windows: Re-partition C Drive

If you resize your hard disk (e.g. when using a virtual machine)  in Windows Disk Manager (diskmgmt.msc) you may find the new partition marked as "Recovery Partition (Healthy)" with the only option as "Help".

If you want to re-size your primary (Windows) partition then you'll need to force delete it.

BE WARNED THIS CAN MAKE YOUR COMPUTER NON-OPPERATIONAL

1. At an elevated command prompt:
   Diskpart
2. At the DISKPART> prompt, select the disk and partition:
   rescan
   list disk
   Select disk X
   list partition
   select partition Y
   Where X is the disk number and Y the partition number
3. Delete the relevant partition:
   delete partition override