Unknown user?

I was looking at the thing of properties on my computer and the security, it was an unknown user. I have not recently deleted an account from my laptop, so I didn't know that an unknown user is possible. I have run scans and nothing came. I'm a little worried is there a way to safely remove unknown user?

(There are two of my knowledge about (S-1-5-21-883045732-3051301496-189930327-1001 unknown and the other is S-1-5-883045732-3051301469-189930327-1000)

Apparently accounts of service/s sid, you can browse the following link to know the security identifiers in windows operating systems:

https://support.Microsoft.com/kb/243330?WA=wsignin1.0

Tags: Windows

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