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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1 The backflow preventer is part of the anti-siphon valve and the pressure loss is included with the valve so you will enter it later. 2  Pressure Vacuum Breaker. 3  You will need to obtain the manufacturerâs pressure loss information for the pressure vacuum breaker you plan to use.