Since you have Windows installation media, we can now go ahead and try using diskpart to reinitialize both drives. (We used to call them "disks" back in the day, so excuse me if I lapse.) I believe this will work, but we can try a little differently if it doesn't. Boot the install media. When you're presented with the Windows Setup screen (with Windows logo), hit Shift-F10 to bring up a command window. Type "diskpart" and wait for the "DISKPART>" prompt.  Type "list disk" and enter. You should see both drives listed, something like: DISKPART> list disk  Disk ### Status        Size    Free    Dyn Gpt  -------- ------------- ------- ------- --- ---  Disk 0   Online         931 GB  931 KB      *  Disk 1   Online         476 GB  476 KB      * Type "select disk 0" and enter, then "list disk" again. You should see the same list except with a star in front of the selected disk. Make sure the star is on disk 0 before proceeding. DISKPART> select disk 0Disk 0 is now the selected disk.DISKPART> list disk  Disk ### Status        Size    Free    Dyn Gpt  -------- ------------- ------- ------- --- ---* Disk 0   Online         931 GB  931 KB      *  Disk 1   Online         476 GB  476 KB      * ^ (Note the star next to disk 0) Type "clean" and enter. This should erase everything on the disk including the GPT low-level format. You should get the message DiskPart succeeded in cleaning the disk. Type "list disk" again and I believe you will see the same list with disk 0 still selected, but without the star in the "Gpt" column. Repeat all the above steps, but this time, select and clean disk 1. Ensure that disk 1 is selected (starred) before entering the "clean" command. With that done, you can close the command window. You should be able to proceed installing Windows via either method, but since you've already started, it should be easier and faster to proceed with Windows installation from the Microsoft media. Install in the unallocated space on Drive 1. Don't worry about the drive numbering. The SATA drive will always be numbered below the NVMe SSD. The system won't get confused; it will boot from the drive that it sees is bootable. After installation is complete, you probably won't see the D drive until you re-initialize it from the Computer Management utility. That's expected so don't worry.
[IMAGE]I am the 2nd owner of this PC and have the original purchase config doc from the original owner. This PC was configured in March 2021 with Win 10 Home. -------------------------------------------------------------------------------- Original owner upgraded PC to Win 11 in Sep 2022.  Upgrade was faulty and/or incomplete for the following reasons When attempting to launch an individually downloaded app or driver, I get the error message: **PC is missing the app to open this ‘res’ link.** (See image above.) I need to revert to Win 10 but am unable to do so because: -Cannot launch the Dell-USB-Recovery-Tool-Application_VYFNW_WIN_2.3.7012.0_A00, which will restore the PC’s original OS and drivers. [How to get a free Windows (or Linux) recovery image for your OEM PC | ZDNET] How to Download and Use the Dell Operating System Recovery Image in Microsoft Windows Use the Dell OS Recovery Tool to create a USB recovery drive that you can use to reinstall the version of Windows or Linux that came with your PC... Dell Note: Windows 11 is ONLY supported with the Automated by **SupportAssist option.** This PC seems to be caught in an infinite loop in which Win 11, and Dell SupportAssist as the only gatekeeper for Win 11, prevent launching the apps needed to revert to Win 10.
Inspiron 7700 AIO- faulty upgrade to Win 11 prevents reverting to original Win 
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