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I found "Unknown account" in the list of user profiles that can be traced from the system properties.
It is a big size of 2.58GB.
A Windows user profile is a collection of information and files associated with an account.
[For example...]
- account name
- password
- OS and application software setting information
- Files and folders created by the user
- ...etc
[Category]
- Local user profile (PC local drive)
- Roaming user profile (eg Windows Server)
Roaming user profiles are set up by your system administrator. PC under Windows Active Directory (domain) must not execute the procedure described here.
I have deleted the "unknown account" found in my user profile so I will post the steps I took and a snapshot.
If you follow the steps below, there is a possibility that your favorite features of Windows Explorer may be broken, but I am also writing about how to fix it.
If you have plenty of room on your local drive, you don't need to follow these steps.
How to view system properties
- Start "Run"
- Type "sysdm.cpl" in the box next to your name
- OK Click on the
- System Properties launch

Source: How to display the [System Properties] screen|sony.jp
- Click the Start button, right-click Computer, and click Properties.
- When the [System] screen is displayed, click [Advanced system settings] on the left side of the screen.
- The [System Properties] screen appears.
- End of procedure
View user profile
Select the Advanced tab of System Properties and click the user profile item setting .System Properties> Advanced Settings

System Properties> Advanced Settings> User Profile
You can delete an unknown account by selecting it and clicking Delete. (It has been deleted)

The identity of the unknown account
A user profile is a collection of important Windows files created for each logged-in user.It is not supposed to be deleted, but there is a Delete button.
...??...
The unknown account is a remnant of the account that was deleted from Windows 7.
[Create account|Delete]
- Create a new account
- A user profile with the account name is created
- Delete account
- The user profile associated with the account remains on the PC hard drive as an "unknown account"
Summary
You can delete unknown accounts, but please be aware that deleting them may cause problems.- Right-click "Favorites" in the left pane of Windows Explorer
- Select "Add Current Location to Favorites"
- Not added to favorites

The above example
This was because the newly created account was accessing some files stored in the unknown account folder.
The Favorites folder is a Windows system folder and must be initialized to recover.

In some cases, 'unknown accounts' in the registry should not be deleted.
Unknown account 'S-1-15-3-1024' deleted. The 'Unknown account' may be an Un-Known SID (SID used by Windows) and should not be easily deleted.

How to delete unknown accounts [Windows 11].
You can delete local accounts using the Settings app or Computer Management. Deleting a local account leaves traces in the user profile as 'unknown account'.
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