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Thread: Delete Files of Previous Operating System In Windows 7

  1. #1
    Join Date
    Feb 2009
    Posts
    192

    Delete Files of Previous Operating System In Windows 7

    One of my friend has upgraded it PC to Windows 7 from Previous version Vista. But there are some files which are undeletable of Vista OS. Even he tried to install windows 7 on another partition, but vista files are left.

    How to delete those files ?

    Please help..

  2. #2
    Dr. V Guest

    Re: Delete Files of Previous Operating System In Windows 7

    Usually this problem of undeletable files and folder is because of Access control list of these object is associated with SID of old operating system user accounts and these users are not present in your windows 7, effectively data is owned by nobody or non-existent user.

    To delete this files,you will need to take control of these files and folders under Windows 7.Here is command line syntaxes to instantly take ownership of such files:
    takeown /f file_name /d y
    icacls file_name /grant administrators:F
    Command line syntaxes to take ownership of directories in Windows 7:
    takeown /f directory_name /r /d y
    icacls directory_name /grant administrators:F /t
    Run the above commands in an elevated command prompt window. These command line syntaxes will grant full permission to administrator group, hence you must be a part of administrator group to take advantage of above command.

  3. #3
    Join Date
    May 2008
    Posts
    2,680

    Re: Delete Files of Previous Operating System In Windows 7

    Usually this problem of undeletable files and folder is security related and can be fixed easily by changing folder security settings , but in this case object is associated with SID of old operating system user accounts and these users are no longer exist in your present installation of windows 7.

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