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 All the valves in the sprinkler valves are linked to the anti-siphon valves. 2  The anti-siphon valves prevent the back flow of water into the main line. 3  Each valve is served by an anti-siphon valve. 4  Each anti-siphon valve will typically cost $10 to $20.