When critical Windows system files are missing or corrupted, some Windows features may stop working correctly or Windows may stop responding altogether. If this happens, you can use the Deployment Image Servicing and Management tool (DISM) and the System File Checker tool (SFC) to scan your system files and restore any corrupted or missing files.

Cumulative Update 15 for Microsoft Exchange Server 2019 was released on February 10, 2025. It includes fixes for nonsecurity issues and all previously released fixes for security and nonsecurity issues. These fixes will also be included in later cumulative updates for Exchange Server 2019.

When you try to access or work with files and folders in Windows, you experience one or more of the following issues: Issue 1: You receive an "Access Denied" error message or a similar message. Issue 2: You cannot access, change, save, or delete files and folders. Issue 3: You cannot open a file or folder after you install a new version of Windows.

Download all MSU files for KB5048667 from Microsoft Update Catalog and place them in the same folder (for example, C:/Packages).

Learn how to update your security processor or TPM firmware to protect Windows 10 and your device from attacks by malicious software.

You'll find direct links to downloadable packages that contain driver and firmware updates for Surface devices. You'll also find a section about imaging for IT professionals. To prepare for updates: Attach your Surface Type Cover or Surface Dock (if you have one) so it gets the latest updates, too. Make sure you have an internet connection.

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.

The Recovery Drive utility in Windows is a valuable tool designed to back up essential system files needed to restore a PC to its original state. This utility creates a USB recovery media that can help you restore your Windows device to its factory settings, even if you replace the hard drive or completely wipe the drive.

We have multiple tools to help you automatically diagnose an issue, troubleshoot, and fix problems with Outlook. Note: Classic Outlook troubleshooters are not applicable to new Outlook for Windows. Check to see if the new Outlook toggle is turned on or off. If it's on, please go to Troubleshooting Outlook issues.

You've come across a file in SharePoint in Microsoft 365, OneDrive for work or school, or Microsoft Teams, but you're unable to open or share it. You can see the file is there, but it's blocked and the file has a warning icon next to it: To protect yourself, your computer, and your organization, the best option is to delete the file.