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 see an "Unknown Account: SID" under the security tab after reinstalling Windows, it’s usually safe to remove. Use lusrmgr to check what the SID corresponds to—for example, a library or unused system reference, not an actual user account. Once confirmed, you can safely delete it by editing permissions and accepting the UAC prompt. This ensures no adverse side effects while keeping your system clean.