To delete the Windows.old folder from an earlier installation of Windows, follow these steps: Advanced users can also use a command prompt to delete files and folders from an earlier installation of Windows Vista.ORE INFORMATION. To delete the Windows.old folder from an earlier installation of Windows, follow these steps: Advanced users can also use a command prompt to delete files and folders from an earlier installation of Windows Vista. To do this, follow these steps:
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Definition of backflow preventer. A backflow preventer is a check valve installed on potable water supply piping to prevent possible contamination of the water supply system by backflowing but contaminated water from the building into the outside public water supply mains.