This article describes an update that enables urgent updates for the Windows Root Certificate Program in Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 8, Windows RT, Windows Server 2012, Windows 7, and Windows Server 2008 R2. Before you apply this update, see more about this update and check out the prerequisites in this article.

Describes general step-by-step methods that you can use to try to resolve common problems that reference the User32.dll file.

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Learn about the recovery options in Windows. Find out how to reset your PC, go back to a previous version of Windows, or use media to reinstall Windows.

Certificate errors occur when there's a problem with a certificate or a web server's use of the certificate. Internet Explorer helps keep your information more secure by warning about certificate errors.

Note: Use these steps for Windows programs. If you're having problems with an app you got from Microsoft Store, go to Fix problems with apps from Microsoft Store.

Symptoms A user who tries to connect to a secured Web site by using Windows Internet Explorer may receive the following warning message: There is a problem with this website's security certificate. The security certificate presented by this website was not issued by a trusted certificate authority. Security certificate problems may indicate an attempt to fool you or intercept data you send to ...

How to attempt to fix the blue screen/stop error WHEA_UNCORRECTABLE_ERROR by using Windows Update, manually updating drivers, using system recovery/repair, or ...

Fixes an issue in which a Stop error occurs on a computer that is running Windows Server 2003 or Windows Server 2008 R2.

Describes the Application Compatibility Update for Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 that is dated April 2011.