How To: Delete Undeletable Previous Operating System Files In Windows 7

You know the fact that Windows Vista to Windows 7 upgrade is possible and Windows XP to Windows 7 upgrade is not possible.When you install Microsoft’s new operating system, Windows 7 on a different hard disk partition and the data from your previous operating system(say Windows Vista) becomes Undeletable in Windows 7.Usually this problem of undeletable previous operating system files and folders in Windows 7 is due to the Access control list of these object is associated with SID of old read more