Windows 10: Unknown second user account

I took the free upgrade to Windows 10 about a week ago. An unknown second user has started appearing on the password log-in screen. It has the name 'smmosbvjntf'. It is easily removed from the user account box but usually reappears on the log-in screen within 24 hours.

I also get a pop up from Tweakbit which wants me to use it to clean up my computer. I'm ignoring that.

I subscribe to Eset and have scanned my laptop several timesusing the Eset scan and have come out with a completely clean bill of health.

Any suggestions of how to rid myself completely of this unknown second account user?

:)

 

Unknown User Account

Hi,

There's a high probability that this issue can be caused by a malware or
a variety of malicious programs. Try performing a full scan on your PC using your antivirus software and check if there are any threats that will be detected.

Just to verify, since when have you been experiencing this issue? Were there any changes made on your device prior to this?

Meanwhile, let's boot your PC in safe mode. This will start Windows with a minimal set of drivers and services to help troubleshoot issues. For instructions on how to start PC in safe mode, please check this link.

Note: If the issue doesn't reappear when you start your PC in safe mode, you can eliminate the default settings, basic device drivers and services as possible causes.

We look forward to your response.

 

Unknown User Account

In my windows 10, most of the application's user name there is an unknown name which I observed is " Account Unknown(s-1-15-3-.....etc )".Is it a malware or rat or inbuilt username. Someone please tell me what it is..

* Moved from Virus & Malware