Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: "unknown Users" are listed in Properties/Security of a folder.

12 Aug 2012   #1

windows 7 64-bit
"unknown Users" are listed in Properties/Security of a folder.

PROBLEM: "unknown Users" are listed in Properties/Security of a folder.

I have Windows 7, 64-bit.

The Properties/Security box of my "C:\Users\[my name]" folder lists two Users called
"Account Unknown (S-1-5-21-879640176-2077098734-2292519611-1001)"
and, "Home Users", in addition to the legitimate Users "SYSTEM", "Administrators", and "[my name]".

After deleting the computer's Limited Acct, the 2 Users are still listed.

"S-1-5-21-879640176-2077098734-2292519611-1001" is not found by the Yahoo Search Engine. The Windows folder-specific search engine for "C:" and for "Users" searches essentially indefinitely. That for the folder named after myself finds nothing.

Especially regarding "S-...", is this caused by malware ? Would deleting either or both of these Users cause harm ?


My System SpecsSystem Spec

12 Aug 2012   #2

Windows 8.1 Pro (x64)

Account Unknown can come from a previous installation or from an account that previously existed but has since been deleted. And you will not find anything within the search engines about the long string of numbers because it is unique on most computers. See:
My System SpecsSystem Spec
14 Aug 2012   #3

windows 7 64-bit

Thanks, logicearth, for the solution and for the reference to Wikipedia. I removed the 2 users from the folder's Properties/Security list.

To all forum users, please consider this thread solved and closed.
My System SpecsSystem Spec


 "unknown Users" are listed in Properties/Security of a folder.

Thread Tools

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 04:12 AM.
Twitter Facebook Google+

Windows 7 Forums

Seven Forums Android App Seven Forums IOS App

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33