Robert in CA wrote:
I'm not sure how hitting the F8 key restores the OS
back to factory? All it does is give the option of Safe
Mode, Safe Mode with Networking etc. What else do
I do?

I don't like using the command prompt is at all possible.
I can screw up too many things there.

Malwarebytes scan completed with no threats found
and it has a scheduled scan tomorrow at 2:11am.

Robert

The Macrium Boot Repair, doesn't seem to pick up the
bootable materials on D: .

OK, using the 2TB clone drive, installed in the XPS 8500,
plus your Macrium CD, Macrium CD has a File Explorer icon
in the lower left. See if you can open the 26GB partition
called Restore or Recovery or whatever, then navigate to
"Tools" folder, and double click the "pcrestore.exe" file.
It may depend then, on whether the Macrium CD is 32 bit or
64 bit, as to whether the "pcrestore.exe" can run or not.

Perhaps that will save you from the horrors of the Command Prompt.

I have to sign off for now, and will be back after some sleep.

Paul