Regsvr32 is a command-line utility to register and unregister OLE controls, such as DLLs and ActiveX controls in the Windows Registry. Regsvr32.exe is installed in the %systemroot%\System32 folder in Windows XP and later versions of Windows. The 64-bit version is %systemroot%\System32\regsvr32.exe.

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Activation helps verify that your copy of Windows is genuine and hasn’t been used on more devices than the Microsoft Software License Terms allow. This article will help you troubleshoot and fix common activation errors in Windows. For help finding your product key, see Find your Windows product key.

Read the instructions on how to use the tool to create installation media for Windows 11 Home and how to do a clean installation. During setup for Windows 11 Home, you'll be asked to enter a product key. Because you already have a digital license for Windows 11 Home, you can skip this step and continue with the installation.

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.

Learn how to activate Windows using an internet connection, automated system, or live support advocate.

First, you'll need to download the troubleshooter. Download troubleshooter. If you see the File Download box when you start downloading, select Run or Open. The troubleshooter provides steps for you to follow. If a program isn't listed in the uninstall options, you'll be asked for that program's product code.

Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.

When critical Windows system files are missing or corrupted, your operating system may begin to malfunction. Common symptoms include Windows features not working properly, system errors, or Windows becoming unresponsive or freezing.

Explains how to back up the registry for restoration in case it gets corrupted in Windows 10, Windows 8.1, Windows 8, or Windows 7.