Sounds like you have a program such as Quicken or Quickbooks or other program that requires it's own User account in order to operate. There are several out there that do this now. If you didn't install a program such as this, then your computer could have been attacked by a virus/malware and that is one of their ploys; they add a 2nd Admin level account with all the same privileges that your Owner account has. It is now a backdoor to your computer for any and all hackers out there. So, if you cannot remove it and you didn't share your computer with a family-member, spouse, or friend, or co-worker and don't know how it got there I suggest you run AV scans for viruses and remove them all. Then download the free MALWAREBYTES antispyware from
Link Removed and remove all found spyware viruses. Reboot your machine. If that 2nd account is still there, your computer has been compromised and needs to be cleaned of viruses.
Geek Squad can do this for you. If it's the virus variant I am thinking of, they will most likely need to reinstall your W10 from scratch to remove it.
Once you get your machine re-loaded with W10 whether you pay a Tech to do it, or do yourself; refrain from installing any programs whatsoever on it, including AV software, MS Office, web updates, Adobe & Java, etc. until you can turn the computer on and off again and verify that there is only 1 user account there. Begin installing all of your software, and install your AV program last. As you install your programs, make certain that you only install them 1 at a time. The reason will become clear in a minute. If you are in the process of installing your programs, and that 2nd User account shows up again, that program that you last installed is likely responsible for adding an unauthorized User account to your computer.
If that happens, identify the program and go to the manufacturer's website and contact them via phone or E-mail and ask them to verify that their program actually does the Account Creation as part of it's normal process. If this is a free program, I would not use it, but rather find a replacement. Usually, only fee-based programs or apps will do this as it requires very sophisticated programming to create and use.
The other thing I'd recommend when reinstalling on your newly repaired computer, is to make certain to only use DISC, USB, or download-links from manufacturer's websites.
DO NOT reinstall from programs previously downloaded in your W10 downloads folder that your or your Tech backed up. That folder is quite likely to be infected with viruses/malware. Again, if you see the problem reoccur, you must suspect the source of the program where you installed it onto your computer from; whether that's local media or a website.
Best of luck,
<<<BBJ>>>
