How to Delete the Windows.old Folder in Windows 7. If you performed repair install, upgrade install, or a custom install without formatting the drive for a clean install and selected to install Windows 7 on the same partition of the previous Windows installation, then you may have a C:\Windows.old folder left over in your new installation. This will show you how to delete the Windows.old folder generated during the installation to free up the hard drive space that the Windows.old folder takes.(((
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