This web page does not contain any information about slui.exe, a file that may cause errors or pop-ups on Windows devices. It explains how to activate Windows products online or by phone.

The web page does not contain any information about slui.exe, a Windows 10 system file. It explains how to fix Windows 10 activation error 0x803F7001, which is caused by various reasons such as hardware change, wrong edition, or missing license.

Learn how to fix common activation errors in Windows 11, 10, 8.1 and 7, such as slui.exe. Find your product key, use the activation troubleshooter, or contact customer support.

Learn how to fix the activation or validation failure with error code 0x8004FE33 when you use a proxy server with Basic authentication. Find out the possible causes, workarounds and more information from Microsoft.

Please note the January 2021 nonsecurity preview release, also known as the “C” release, was released February 2, 2021 and is separate from the January security release, also known as the “B” release, which was released January 12, 2021.

Locate and then click the following registry subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SL\Activation. Change the DWORD value Manual to 1. 0 = Allow Auto-activation (Default) 1 = Disable Auto-activation. Exit Registry Editor, and then restart the computer. Enable the Auto-activation feature.

The SLUI 04 command shouldn’t be used—it won’t produce a usable installation ID or confirmation ID. You can only enter a new product key by going to Settings > Update & Security > Activation and selecting Change product key .

Open Get Help. Checking your Windows activation status. You'll first want to find out if your Windows 11 is activated and linked to your Microsoft account. It is essential that you link your Microsoft account to the Windows 11 license on your device.

In the Windows activation section, click the Change product key.If you are prompted for an administrator password or for confirmation, type your password, or click Continue.

Error: 0xC002001B On a computer running Microsoft Windows non-core edition, run 'slui.exe 0x2a 0xC002001B' to display the error text. Cause This issue occurs because a null string was created in the token activation issuance license (TAIL).