So the other day I had to fix a family members computer, its PSU had stoped workin, so I changed it to a PATA compatible PSU, from a SATA one, and changed our HDDs, expect my primary one that had Windows 7 installed on it. And installed Windows 7 on my secondary one, and put it in his computer. I was not able to format the disk I stole from him, so I gave the permission from trusted installed to me, but now I can't format it because "it's being used" although I cna't find anything on it that would be able to be used, and no windows open explorering it. So I tried deleting the folders in it manually, but I didn't have permission from Kiipas_computer/Kiipa (which is me) who I had given permission to.
So, anyone know a fix to this? I'd like to be able to format it, because it's faster. The things left on it is Windows (vista) and Program Files, if that would help anything.