11/25/2024: I am satisfied. Windows 10 is functioning and updates normally. Secure boot TPM 2.0 and UEFI capabilities are unobtainable with the current Legacy BIOS. Question answered. Case closed.
11/22/2024: Thank you Ramhound, for your advice, education, and proofreading. Windows 10 problems solved:
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And:
I updated my ancient NVIDIA GeForce 210 Graphics card to the latest available update. The display on both monitors have noticeably improved. I did not see mention of WDDM drivers from NVIDIA.
Not mentioned in my initial question, recently Windows 10 cannot update features and security. MS Techs are yet to find a solution. I was concerned my old BIOS may have contributed to this problem but the available ASUS BIOS updates do not appear to address the issue.
I regularly clone my OS SSD and Data WD HDs. My Legacy BIOS tags each drive with MBR. I do not know if they would open or function on a UEFI BIOS motherboard.
Although Microsoft will soon cease updating Windows 10 features, I understand Microsoft will offer Windows 10 users some security updates at a nominal annual cost.
I must accept what I can do without learning new OS software and/or buy some new hardware, something to avoid. I spend my time researching history and genealogy and writing stories. I thought getting Secure Boot would keep my status quo.
I wish to do something with the BIOS to obtain Secure Boot, TPM 2.0 and UEFI capabilities. Below are the specs of my 13-year-old PC.
Device Name: MY-2011-DESKTOP
Motherboard: SABERTOOTH X58 Rev 1.xx
Serial Number: B2M0AC164797
1. BIOS: American Megatrends Inc. 0802 12/21/2010 Updates available (not installed) are:
BIOS Version 0902 (2011/01/08) [Improve USB compatibility]
BIOS Version 1006 (2011/04/21) [Update Intel Raid Option ROM & Fix USB3.0 Overcurrent check]
BIOS Version 1201 (2011/07/02) [Improve System stability & support new CPUs.]
BIOS Version 1304 (2011/09/26) [Improve stability on Marvell controller]
BIOS Version 1402 (2012/08/29) [Improve VT-d compatibility issue]
Processor: Intel® Core™ i7 CPU 950 @ 3.07GHz 3068 Mhz, 4 Core, 8 Logical Processor(s)
Installed RAM: 24.0 GB System type: 64-bit operating system, x64-based processor