The problem symptom occurs because the undeletable files and folders’ ACLs (Access Control Lists) were set for accounts with SIDs that applied to an old partition. So these data will effectively owned by nobody or non-existent user when view in Vista operating system. In order to access the file for manipulation, modification or deletion, we will need to take control of the files under Windows.
We can use 2 command-line utilities to take ownership of the files or folders, and then grant full control access permissions to Administrators group, which supposedly you’re a member of. The 2 command line syntaxes are as below. Note that the full path should be included if you’re not at the current directory, and to run these commands, command prompt has to be in elevated mode.
takeown /f file_name /d y icacls file_name /grant administrators:F
For Directories (will perform action recursively):
takeown /f directory_name /r /d y icacls directory_name /grant administrators:F /t