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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Kentucky plumbing codes and standards [815 KAR 20:120, Section 2 (7)] for backflow preventers include: 1  Air gap. 2  Reduced pressure principle back pressure backflow preventer. 3  Double check valve assembly.  Pressure type vacuum 1  breaker. Atmospheric type vacuum breaker.  Barometric loop.