Try an older Rufus version if the latest fails on Windows 7.
: Rufus 4.0 and later require Windows 8 or newer. For Windows 7, you must use Rufus 3.22 or earlier External Access Conflicts rufus access to device denied windows 7
The "Access to the device is denied" error in Rufus on Windows 7 is a frequent roadblock for users attempting to create bootable USB drives, often triggered by a lack of an on the target disk . Summary of Causes and Performance Try an older Rufus version if the latest fails on Windows 7