XPS 8930, USB entry puzzle

Did you change BIOS from RAID to AHCI before doing the clean Win 10 installation? 

How did you reinstall Windows, using the Microsoft Windows Media Creation Tool to create a bootable USB stick? 

From first look at your list of failures, I suspect Intel Chipset and Intel Management Engine driver may not have been installed. So install those two (in order listed), reboot, and then see if you still get errors marks in Device Manager.

While in Device Manager, click View>Show hidden and then look everywhere in DM for any "Unknown" devices. Right-click and Uninstall any "Unknown". Then click Action>Scan for hardware changes. When that's done, reboot and look for any error marks in DM again.

NOTE1: What version of SupportAssist are you running? SupportAssist Dxxxx errors, eg USB error D0605, are actually internal, harmless and "info only".  So you can ignore them. But you still have to resolve the triangle and ! notations for USB in Device Manager, which -hopefully- installing Chipset and ME will fix.

NOTE2: If some hardware still doesn't work or has an error warning in Device Manager, you might need to install their drivers, since some drivers may not install or may not work if Chipset and Management Engine weren't installed first. 

@RoHe​  Thanks for your assistance...

Did you change BIOS from RAID to AHCI before doing the clean Win 10 installation?
Not sure. It is AHCI now so I did at some point.
How did you reinstall Windows, using the Microsoft Windows Media Creation Tool to create a bootable USB stick? 
A bootable USB drive.
From first look at your list of failures, I suspect Intel Chipset and Intel Management Engine driver may not have been installed. So install those two (in order listed), reboot, and then see if you still get errors marks in Device Manager.
I installed each and restarted after each and error mark is still there in Device Manager.
While in Device Manager, click View>Show hidden and then look everywhere in DM for any "Unknown" devices. Right-click and Uninstall any "Unknown". Then click Action>Scan for hardware changes. When that's done, reboot and look for any error marks in DM again.
Nvidia High Definition Audio is Code 32 disabled because I tried to turn off the Nvidia entries. One of the USB Input Device listings is Code 10 cannot start. No unknowns. After Action>Scan, Nvidia Audio lost warning sign before restart. After restart, warning sign returned.
What version of SupportAssist are you running?   4.0.3
If some hardware still doesn't work or has an error warning in Device Manager, you might need to install their drivers, since some drivers may not install or may not work if Chipset and Management Engine weren't installed first. 
Install USB driver again? VM_CFL_0859_114xFWUpg0205_150707_30_02_1F_x64_ZPE (2).exe?          It appears that was already installed.

When was last time you replaced motherboard battery?  You may want to do that now, if nothing else than to rule the battery out:

1. Reboot and start tapping F2 when you see the Dell splash screen to open BIOS setup
2. Copy all current BIOS settings, to be safe
3. Power off, unplug power cord from rear of PC
4. Press/hold power button for ~15 sec
5. Open case and remove motherboard battery (check Service Manual for details)
6. Press/hold power button for ~30 sec
7. Reinstall M.2 NVME SSD and other (working) hardware you may have removed.
8. Install fresh CR2032 3-volt coin cell battery
9. Close up and connect mouse, monitor and keyboard
10. Reboot and test function and look for error codes in Device Manager

Exactly which USB entry is giving the code 10?  If clearing BIOS+new battery don't resolve the USB code 10, read this for ways to ID/fix it. 

Download correct NVidia driver for your GPU and version of Windows from Dell's XPS 8930 support page, but do not install it.

Then download/install DDU (free). Run it to remove the old NVidia driver. Be sure to follow DDU instructions to boot in Safe Mode and disconnect PC from its internet connection.  After DDU finishes, install the NVidia driver you downloaded, before you reconnect PC to the internet.

@RoHe​ Is there a setting for copying BIOS settings?

You either can copy current BIOS settings by hand or take pics with a phone...

BTW: You mentioned that BIOS wouldn't let you reinstall the M.2 NVME SSD. What did you mean by that? 

@RoHe​ Can't figure out how to do it.

@mcfallison2​ Took your advice on replacing the motherboard battery. Huge difference. Computer much more responsive now. Thanks!

But USB failure still listed.

What couldn't you figure out?

Did you clear BIOS after removing old battery by pressing/holding power button for ~30 sec before installing the fresh battery?

Where is the USB failure still listed? If it's in SupportAssist with error D0605, just ignore it. That's an irrelevant SupportAssist problem. If it's in Device Manager, exactly which USB entry is marked with an error?

You can also try this:

1. At desktop, open a CMD prompt window, Run as administrator
2. At the prompt, type in: chkdsk c: /r and press Enter. Accept offer to run chkdsk at next boot and reboot. chkdsk will run before Windows loads so be patient. When PC is back at desktop, you can open the chkdsk log to see if there are any "unfixed" errors.
3. Assuming no unfixed chkdsk errors, open CMD again, exactly as in #1
4. At the prompt, type in: DISM.exe /Online /Cleanup-image /Restorehealth and press Enter. Be sure to include a space in front of each / and note any error messages when that's done.
5.  Assuming no "unfixed" errors in #4, at the CMD prompt, type in: sfc /scannow and press Enter. Be sure to include a space in front of the / and note any errors when that's done.
6. Assuming no "unfixed" errors in any of above, reboot PC and see if that fixes the USB problem.
   NOTE: This won't fix D0605 errors in SupportAssist, so just ignore them, as long as all USB ports and connected devices are working properly.

@RoHe​

@RoHe​ You know what, I think it's time to declair defeat. This 8930 is beyond redemption. Thanks for your help and willingness to help. I will be in the market for another computer. 

Did you run the commands I posted? Did they all complete without any errors or warnings? 

Run all the diagnostics via the F12 menu option. This will take a while so be patient. Then view the results screen for any errors.

What does that USB Input Device screen say on its driver and details tabs?

What USB devices are plugged into this PC and where? Are you using wired or wireless mouse and keyboard? If wireless, does either of them use a Bluetooth USB dongle? Are mouse and keyboard plugged into rear USB2 ports on PC?

Disconnect all USB devices, including any USB connection(s) to monitor, leaving only mouse and keyboard connected to PC. Reboot and if you still see that error, move mouse and keyboard to different USB ports and reboot. See if you can ID a bum USB port or device.

And if all else fails, try using a different USB mouse and keyboard.

One recommended step that I found here is to shut down the computer, unplug all USB devices except mouse and keyboard, unplug the power cable, press the power button to discharge any residual charge, wait a minute and power up the 8930 and then plug the USB peripherals. It worked for me.

If the USB entry cannot start, is it likely to be software or hardware?

@mcfallison2​ : Did you try that USB device on a different computer? That may give a clue?