Some time ago, I used my Windows 10 computer to reinstall a clean version of Windows 10 on a hard drive that I subsequently removed and installed on another computer. The latter computer belonged to a family member and was running Windows 10 very slowly. I suspected that it might have been compromised with resource-sapping PUPs (Potentially Unwanted Programs). had been performing very slowly. I decided to do a clean install of Windows 10 using my main computer and then transfer the hard drive back to the misbehaving computer.
I completed that task without incident. That gambit solved the family member's computer ills. However, when I reconnected my computer's hard drive and rebooted I got a boot screen that asked which Windows 10 hard drive I wanted to boot. Since I only had one hard drive in the machine with Windows 10 installed, I chose the first listing of that operating system, setting it as the default choice and booting in one second. I did not have the option of removing the other OS listings nor could I set the boot delay to 0 seconds.
For almost a year, I lived with this small annoyance. It didn't matter much because I rarely shut the machine down. However, the inability to bypass the boot screen listing non-available choices still bothered me. Today. I learned how to fix the problem.
To that end, I documented the process that I followed and posted it on my web site. View it at www.fullbean.com/tutorials/fix-boot.mp4
Also on YouTube at https://youtu.be/g47VFwcqRaw