Describes the steps to take when you receive an "Outlook blocked access to the following potentially unsafe attachments" message in Outlook.

Solve problems with detecting and removing malware with Windows Security, including incomplete scans, detection errors, and persistent malware.

If File Explorer won’t open or start in Windows, it makes everyday tasks like finding files, opening folders, or managing storage difficult. This article walks through simple troubleshooting steps—such as checking for updates, restarting your device, and resetting Windows—to help restore File Explorer and get it working again.

Get troubleshooting tips if you run into problems downloading, installing, or updating Microsoft Edge.

If you’re experiencing network or website connectivity issues, the Hosts file may be part of the problem. This article explains what the Hosts file is, how it works, and why resetting it to the default state can resolve common connection issues. What's the Hosts file The Hosts file is a plain‑text system file used by the operating system to map human‑friendly hostnames (such as contoso ...

Learn how to identify, remove, and prevent unwanted software on your PC.

Summary Starting with Windows security updates released on and after October 14, 2025, File Explorer automatically disables the preview feature for files downloaded from the internet. This change is designed to enhance security by preventing a vulnerability that could leak NTLM hashes when users preview potentially unsafe files. For more details, review the following frequently asked questions ...

Resolve Windows blue screen errors with tips and resources to do your own troubleshooting, or contact the Microsoft support if you need more help.

Learn how to protect your device with Windows Defender SmartScreen and other app and browser control settings in Windows Security.

Find out the steps you can take if you receive a message telling you a driver can't load on your device.