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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Silicone anti-drain back valves. 1  Help prevent oil from draining out of the filter and engine when the engine is not running. 2  Resist the aging effects that an engineâs high heat can cause. 3  Silicone, available in many MotorcraftÂ® oil filter anti-drain back valves, is superior to nitrile rubber, which can become brittle over time.