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: "Account Unknown"

05 Mar 2012   #1
Gwaihir

Windows 7 Professional 64-bit SP1
 
 
"Account Unknown"

Firstly apologies as I know this has been raised before. I did a search but the threads I found didn't give any answers that made sense to me.

When I look at the permissions for a text document I find among the list of accounts the following:-

"Account Unknown(S-1 -5-21 -5372119434272335595-134997445-1000)"

When I open the User Accounts in Control panel there is no such account shown, nor is it shown if I look in Local Users and Groups in Computer Management.

Could someone explain, preferably in simple terms, what this entry is, whether it is desirable to get rid of it and if so how?

Thanks for any help.


My System SpecsSystem Spec
.
05 Mar 2012   #2
Maguscreed

Microsoft Community Contributor Award Recipient

Windows 7 x64
 
 

It appears to be a temporary permission, the SID or security identifier number checks out so I do not believe it to be malicious though if that was your concern.
My System SpecsSystem Spec
05 Mar 2012   #3
Dave Atkin

Windows 7 Ultimate x64
 
 

Hello,

Its probably a user account that has been removed or recently deleted.


The long number is a SID (Security Identifier) number. You can remove it via the security tab in the properties (Right click on the file and select properties, click security).

See:
(en.wikipedia.org/wiki/Security_Identifier).


Dave
My System SpecsSystem Spec
.

05 Mar 2012   #4
Gwaihir

Windows 7 Professional 64-bit SP1
 
 

Thanks for your responses. Yes, my primary concern was that it might have been created by malware in order to gain access to my system. A secondary worry was that if it was legitimately created by the system then deleting it might make the file inaccessible.

Dave, I haven't created or deleted any user accounts since installing the OS. I did do a re-install of the OS since the original installation, but this was after changing partition sizes and reformatting the partitions so was a clean install.

I think I'll try removing it and see what happens.
My System SpecsSystem Spec
05 Mar 2012   #5
Dave Atkin

Windows 7 Ultimate x64
 
 

Is it a file you have copied from another PC? Sometimes they retain the permissions.

Do a Malware scan just to be sure but I wouldnt worry about it too much.


Dave.
My System SpecsSystem Spec
05 Mar 2012   #6
Gwaihir

Windows 7 Professional 64-bit SP1
 
 

Hi Dave,

That's an interesting question. When I upgraded from XP I copied all my user files to an external drive then copied them back onto the new system. Maybe that could be the explanation? If so then presumably this would apply to every file.

Interestingly when I removed the Account Unknown from the list of permissions ALL the permissions were removed and I then had to individually add back the ones I wanted.
My System SpecsSystem Spec
05 Mar 2012   #7
Dave Atkin

Windows 7 Ultimate x64
 
 

Hi Gwaihir,

Yes it could explain the permissions from an old user. It shouldn't have removed the other permissions as well but as long as you can gaion access to it then again dont worry too much unless its causing you a problem.

Do a virus scan anyway - Just to be safe .


Dave
My System SpecsSystem Spec
05 Mar 2012   #8
Gwaihir

Windows 7 Professional 64-bit SP1
 
 

Hi Dave,

No, no access problems after deleting it. I've checked a few other files and they all have it so it looks like you've nailed it.

Far too many files to change so I'll just leave alone as long as it's not malicious. I have Avast free anti-virus and will try a scan.

I'll think I'll mark this thread as solved now. Many thanks for your help.
My System SpecsSystem Spec
05 Mar 2012   #9
Dave Atkin

Windows 7 Ultimate x64
 
 

Anytime .

Dave
My System SpecsSystem Spec
09 Sep 2013   #10
ankrotachi

Windows 7 Home Premium 64-bit
 
 

There were multiple account unknown on mine, and one cannot be removed, was not originally an admin, but has full control, what do I do?
The attached picture shows you cannot remove the selected account from the permissions:


Attached Images
"Account Unknown"-capture.png 
My System SpecsSystem Spec
Reply

 "Account Unknown"




Thread Tools Search this Thread
Search this Thread:

Advanced Search




Similar help and support threads
Thread Forum
changing an ".ost"file to open with "unknown" application
I changed my outlook email .ost file to open with auto cad by mistake. Initially it was opening with an Unknown application. How can I enable it to open with an unknown application again? please help
Software
User account control shows "Publisher: Unknown" for File Operation
Hello. My computer recently (less than a day ago) started to display User Account Control prompts whenever I deleted or copied that weren't in the "Users" folder, such as the Program Files folder. I am using an Administrator account, and the User Account Control is set to notify when programs...
System Security
Account "Roger" appears as "c:\users\user"
Hi all, I recently created a new user account on a win 7 home premium machine before I'd had much experience with win 7 (but years with 2000 and xp). Instead of users\Roger\ it created users\user which I now realise is not correct. (I didn't call my account "user", either, before you ask. :) )...
General Discussion
Finding (and removing) "Account Unknown"
16 months ago, I retired and replaced my companies old WinXP PC with a PC of my own running Win 7 Ultimate. I transferred my external USB disk enclosure, which is formatted NTFS, to my new PC. In this process, I ended up with an "Account Unknown(S-1-5-21-713417444-3787200217-3916..." in my...
General Discussion
My account missing and a "Other User" account appeared?
Hi everyone. I wonder if anyone can help me with my problem. I turned off my laptop as I used my mom's laptop to play a game she had. I went back to my laptop, turned it on and I can't log in! After the welcome screen there's only a "Other User" and nothing else. My account isn't shown. I tried...
General Discussion
Windows 7 OEM, "You're account as been disabled." Admin account
Hi all, Just installed an OEM version of Windows 7 Ultimate on a custom-made machine. It gets to the point of logging in. I type in Administrator and press enter, and I get the response, "You're account has been disabled. Please see your network administrator." As it stands, I can't log in at...
General Discussion


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 05:11.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App