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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Backflow Prevention Principles. When the flow of water is reversed from an irrigation system back into the potable system, a. backflow condition is created. If contaminants are allowed to flow back into the potable water. system, even in minuscule quantities, the population is at risk of consuming fertilizers, pesti-. cides, soil bacteria and animal residues. Any connection between the potable water supply and a source of contamination is called a. cross-connection.