Use the System File Checker tool to repair missing or corrupted system files. When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether.

IMPORTANT You should apply the Windows security update released on July 8, 2025, or a later update as part of your regular monthly update process. This article applies to those organizations who should begin evaluating mitigations for a publicly disclosed Secure Boot bypass leveraged by the BlackLotus UEFI bootkit.

By default, if you do not press a key for 15 minutes, the Windows logon screen saver (Logon.scr) starts. Click Start, click Run, type regedt32, and click OK. SCRNSAVE.EXE string value item. In the Value data box, type the path and name of the screen saver, and then click OK.

Changing the desktop background is a simple yet effective way to personalize your Windows device and make it feel more like your own. Whether you prefer a serene landscape, a favorite photo, or a solid color, Windows offers a variety of options to customize your desktop to suit your style. Here are the steps to change the desktop background:

When you add a modern page to a site, you can add and customize web parts to build your SharePoint page. This article describes the Embed web part. You can display content on your SharePoint page from sites that allow embedding (like YouTube or Bing maps, for example).

To locate your screenshots, open File Explorer from the taskbar. On the side navigation pane, select the Pictures folder, and select Screenshots. View the full list of keyboard shortcuts. You can also use Snipping Tool to capture screenshots.

Learn how to use Snipping Tool to capture a screenshot, or snip, of any object on your screen, and then annotate, save, or share the image.

On the red Message Bar, you can click the warning text. You can also click the File tab to view additional information and options there. Here are some examples of Message Bars. If you don't want security alerts, you can turn off the Message Bar. Important: We advise that you do not change security settings in the Trust Center.

If the SCRNSAVE.EXE registry value is "C:\Windows\system32\PhotoScreensaver.scr," no action can be taken because the SCRNSAVE.EXE registry value is encrypted. After you install the hotfix, you may lose any customized power settings.

Press Windows logo key+Shift+S. The desktop darkens so you can select an area for your screenshot. If you select rectangular or free-form mode, you must then click and drag to highlight the area you want to capture. If you select window or full-screen mode, the capture takes place immediately.