I know it and this is the problem
as mention in the link at microsoft you sent
Option 1: Using the Windows interface:
I did: Computer Management (Local) > Storage > Disk Management, Right-click the dynamic volume you want to delete, and then click Delete Volume
the problem: the "delete volume" is not active
2) Using a command line:
I did: in the DISKPART prompt -->, type:list volume, type: select volume n, At the DISKPART prompt, type: delete volume
the problem: "Virtual Disk Service error: Delete is not allowed on the current boot, system, pagefile, crashdump or hidernation volium"
Arie