Cant Delete Windows Old. Your old OS didn't get erased; rather, it's lingering in a system folder called, aptly enough, Windows.old. Take ownership of Windows.old folder, grant full access to your user account in NTFS security permissions, once done, try deleting the folder.
Alternatively, you can also use a command prompt to delete files and folders from an earlier. If none of the issues presented work, try Ultimate Boot CD, go into the included file manager (if it's still. Windows.old is automatically generated whenever you perform an installation of Windows with a previous version of the OS already installed.
Alternatively, you can also use a command prompt to delete files and folders from an earlier.
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Generally speaking, Windows cant delete certain files while Windows is running. You can easily delete the entire windows.old folder by running the disk cleanup utility. Scroll down to check the #complete solutions# with.