Forum Discussion
Unknown Account: SiD
So i know many people have an issue where they re-install windows or for whatever reason they encounter an "Unknown Account: SID" under their security tabs. Please note that you can always use lu...
If you encounter an "Unknown Account: SID" under security tabs after reinstalling Windows, you can use lusrmgr to identify what it is. For example, a SID might link to something like "Your music library," not a user account. In such cases, it's safe to delete by changing permissions and accepting the UAC prompt. No adverse effects—this helps clean up unnecessary entries safely!