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Windows 7: Unknown Account

16 Jul 2010   #1

Vista,Win 7 Dual Boot
Unknown Account

I noticed that in security tab I have a unknown Account. I have recently Reinstalled do to being unable to remove some viruses. I don't Know if the account is due to a virus or what it's for.(BTW I have Dual Boot vista win7)

My System SpecsSystem Spec
16 Jul 2010   #2

Microsoft Community Contributor Award Recipient

Windows 10, Home Clean Install

Run a good antivirus scan and download and scan with malwarebytes. If negative, I would bet that is an account opened by one of your programs. There are a number of programs that function from their own account.

Run this scan
My System SpecsSystem Spec
16 Jul 2010   #3

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86

AFAIK, the Account Unknown refers to a user account that previously existed on a computer and was later deleted. That long number you see is the security identifier (SID) for that account. Since the actual user doesnt exist any longer, windows cant link the SID to a username, hence "Account Unknown".

You should be able to remove it safely. Click on "Edit" on that window, then click on "Remove". Alternatively, you can just let it be- its not bothering you or eating up any space.
My System SpecsSystem Spec


 Unknown Account

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