The most effective single solution was , as it removes hidden volume locks and corrupt partition tables. However, it erases all data on the drive.
If the issue persists, try formatting the USB drive through Windows. rufus access to device denied windows 7
Uninstalling the antivirus (even temporarily) is more reliable than disabling it. Many antivirus drivers remain active even when the GUI says "disabled." After uninstalling, reboot and test Rufus. You can reinstall the antivirus later. The most effective single solution was , as
Your USB might have a "read-only" attribute or a corrupted partition table that prevents writing. The most effective single solution was