One quite annoying UAC problem I’ve seen a few times is when UAC appears, there are two or double account names.
Run this from an admin prompt to remove the double UAC credentials that appear on the UAC dialog box:
Windows 7
REG.EXE DELETE “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\Credential Providers\{6f45dc1e-5384-457a-bc13-2cd81b0d28ed}” /f
Windows 10
REG.EXE DELETE “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Authentication\Credential Providers\{4B2F0B15-CB86-40FD-8139-
Notes
Depending on the current operating system configuration and existing authentication mechanisms (e.g. biometric devices), other Windows Credential Providers may still be visible. The following is a list of default Windows 7 Credential Providers CLSIDs and can be used as a reference, to hide other Credential Providers using the group policy as well:
Windows 7
| Credential Provider | CLSID |
|---|---|
| GenericProvider | {25CBB996-92ED-457e-B28C-4774084BD562} |
| NPProvider | {3dd6bec0-8193-4ffe-ae25-e08e39ea4063} |
| VaultCredProvider | {503739d0-4c5e-4cfd-b3ba-d881334f0df2} |
| PasswordProvider | {6f45dc1e-5384-457a-bc13-2cd81b0d28ed} |
| Password Provider\LogonPasswordReset | {8841d728-1a76-4682-bb6f-a9ea53b4b3ba} |
| Smartcard Credential Provider | {8bf9a910-a8ff-457f-999f-a5ca10b4a885} |
| Smartcard Pin Provider | {94596c7e-3744-41ce-893e-bbf09122f76a} |
| WinBio Credential Provider | {AC3AC249-E820-4343-A65B-377AC634DC09} |
| CertCredProvider | {e74e57b0-6c6d-44d5-9cda-fb2df5ed7435} |
Windows 10
| Credential Provider | CLSID |
|---|---|
| Smartcard Reader Selection Provider | {1b283861-754f-4022-ad47-a5eaaa618894} |
| Smartcard WinRT Provider | {1ee7337f-85ac-45e2-a23c-37c753209769} |
| PicturePasswordLogonProvider | {2135f72a-90b5-4ed3-a7f1-8bb705ac276a} |
| GenericProvider | {25CBB996-92ED-457e-B28C-4774084BD562} |
| NPProvider | {3dd6bec0-8193-4ffe-ae25-e08e39ea4063} |
| CngCredUICredentialProvider | {600e7adb-da3e-41a4-9225-3c0399e88c0c} |
| PasswordProvider | {60b78e88-ead8-445c-9cfd-0b87f74ea6cd} |
| PasswordProvider\LogonPasswordReset | {8841d728-1a76-4682-bb6f-a9ea53b4b3ba} |
| FaceCredentialProvider | {8AF662BF-65A0-4D0A-A540-A338A999D36F} |
| Smartcard Credential Provider | {8FD7E19C-3BF7-489B-A72C-846AB3678C96} |
| Smartcard Pin Provider | {94596c7e-3744-41ce-893e-bbf09122f76a} |
| WinBio Credential Provider | {BEC09223-B018-416D-A0AC-523971B639F5} |
| IrisCredentialProvider | {C885AA15-1764-4293-B82A-0586ADD46B35} |
| PINLogonProvider | {cb82ea12-9f71-446d-89e1-8d0924e1256e} |
| NGC Credential Provider | {D6886603-9D2F-4EB2-B667-1971041FA96B} |
| CertCredProvider | {e74e57b0-6c6d-44d5-9cda-fb2df5ed7435} |
| WLIDCredentialProvider | {F8A0B131-5F68-486c-8040-7E8FC3C85BB6} |
* these also apply to duplicate usernames on the logon screen
References
https://community.sophos.com/kb/en-us/114190
tags: dual, duplicate, login screen, user screen, welcome screen