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Hello，SwitchTech
Welcome to posting in the Microsoft Community.
Very much understand your current confusion and frustration, especially after several attempts without resolving the issue. Based on the information you've provided, the issue involved may be related to several things, including Rufus settings, the integrity of the ISO file, and the BIOS settings of your device, which is a rather complex situation.
First of all, Rufus is a powerful tool, but there may be compatibility issues when working with certain Windows 11 ISO files, especially with write modes. Current newer Windows 11 ISO files often require UEFI booting, and if you're still running in Legacy Boot mode, this may cause Rufus to create a boot disk with a mismatch in write mode settings, and thus fail to boot successfully. Additionally, the scenario mentioned in your error message suggests that the system is attempting to boot an operating system that requires UEFI support in Legacy mode, which further suggests that the boot mode setting and the boot disk match are in a state of conflict.
Secondly, the mention of multiple failures in the extraction process may be related to the integrity of the ISO file itself. It is possible that slow network speeds may have caused the downloaded ISO file to become partially corrupted, thus interrupting the Rufus extraction. It is recommended to check the integrity of the ISO file to make sure it is not corrupted or missing some data.
If you need to continue using Rufus, we recommend going to the official Rufus-related support pages and communities, where more users of the software will be able to assist you. In the meantime, you might consider trying Windows ADK , which is a tool for creating large-scale deployments. Since it's a Microsoft tool, you can better ensure the compatibility and integrity of the ISO, which may be a safer option, especially if you've had several failed attempts with third-party tools.
Alternatively, you can check the device's BIOS settings, try switching to UEFI mode (if this device supports it), or install a system that matches your files in Legacy mode. If you are not sure how to adjust the BIOS, it is recommended to refer to the official documentation or technical support for your Dell device. Ensuring that Secure Boot is turned off is also a common practice when resolving many boot issues.
Finally, regarding packaged installations of Windows, the Microsoft Learn community provides a dedicated board for ISO installations, BIOS configurations, or boot disk creation for this type of advanced user technical support. Because the boards are cumbersome, I will direct you to the supported location by clicking:
We hope that your question is in the right neighborhood where you can get help and get it up and running as soon as possible. Thank you for your understanding and and cooperation!
Best Regards，
Rota|Microsoft Community Support Specialist