Windows 10: What is this SID or user ? is this a virus?

Hello,I just found out that i have a user name call S-1-5-21-357168193-1226460482-955065123-1001.i have never mad other user or deleted user before.i dont remember this user being here.or this is just normal thing for all the windows10 user.also exposing my user SID like on picture bad? like for security reason.Thank you!

:)

 

Mystery SID. Help plz.

Open Command Prompt or PowerShell, enter command wmic useraccount get name,sid. This gives you a detailed list showing which SID belongs to which user account.

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Lost myWin10 User Partition Name

Stu,

I do not understand:-
1 The "USER" account appears in many places in Admin
2 bootable user - you've used this term before but it is not a defined term and I don't know what you mean.

I can take you through a series of commands to check exactly what each user account thinks is its user folder path. It's going to get too confusing with aliases such as "USER" so, if you are willing, perhaps you can post the results of the checks in PMs to me and I'll be careful to avoid using real usernames in posts here.
Step 0 In all steps, ignore user 'accounts' called DefaultAccount, defaultuser0/1/…, Guest, WDAGUtilityAccount
Step 1 Run this command Code:

This tells you the SID for each username.
Step 2 Run RegEdit, go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
Step 3 For each of the SIDs in the Registry SubKeys beginning S-1-5-21, select it and look at its ProfileImagePath entry.
Step 4 Step 3 tells you the ProfileImagePath [user folder path] for each SID and you can then look up which user name it relates to using the results of Step 1.
So now you can see which user folder path Windows thinks it should use for each username.

Please post [here or in a PM to me] the list of usernames, SIDs, user folder paths.
Please confirm that those user folder paths get shown in File explorer, C:\Users.

Denis

 

Current active users that are friends

The other reason I suggested this is that users can add characters to their username that are not alphanumeric (e.g. user*). This confuses things somewhat when looking at the list.