On my machine I have two HDDs and in both I have a Windows 8 x64 installed. I booted from one of them and tryed to delete the contents of the other one (D:\Windows for example), but Windows 8 don't let me go on, for example, I tried to delete %ProgramFiles%/WindowsApps (hiden folder) and the folowing message was poped to me:
In this case I can't even open and read the folder content.
How could I delete the contents of this disk without having to reformat or even without having to boot a Linux on this machine?