A final update:
So, doing a clean install is not a path I wish to go down, since it should not be required for any decent software. Below is my latest correspondence with "Support".
FROM SUPPORT: Lars Fermvall, Thank you for contacting Corel Technical Support. Regarding your error, please contact your computer manufacturer because it's a system issue of your computer. Please do not hesitate to contact us with any further questions. Regards, George Corel Technical Support Services MY REPLY: Dear George, So, let me get this right: After I install NXT4 on my computer, and only then, does the boot path reference get destroyed and therefore I should contact Dell and ask them to repair my computer? I note that others have come across this issue as well: http://forums.support.roxio.com/topic/121895-nxt4-stopped-my-win-10-x64-from-booting/ I will not contact Dell (since they will just send me back to the supplier of the software), but I will instead request a refund for my NXT4 purchase and find another product that is usable. Regards, Lars Fermvall