Microsoft Safety Scanner Download

Microsoft Safety Scanner is a scan tool designed to find and remove malware from Windows computers. Download it and run a scan to find malware and try to reverse changes made by identified threats.

• Download Microsoft Safety Scanner (32-bit)

• Download Microsoft Safety Scanner (64-bit)

Important information

• The security intelligence update version of the Microsoft Safety Scanner matches the version described in this web page.

• Microsoft Safety Scanner only scans when manually triggered. Safety Scanner expires 10 days after being downloaded. To rerun a scan with the latest anti-malware definitions, download and run Safety Scanner again. We recommend that you always download the latest version of this tool before each scan.

• Safety Scanner is a portable executable and doesn't appear in the Windows Start menu or as an icon on the desktop. Note where you saved this download.

• This tool doesn't replace your anti-malware product. For real-time protection with automatic updates, use Microsoft Defender Antivirus on Windows 11, Windows 10, and Windows 8. These anti-malware products also provide powerful malware removal capabilities. If you're having difficulties removing malware with these products, you can refer to our help on removing difficult threats.

System requirements

Safety Scanner helps remove malicious software from computers running Windows 11, Windows 10, Windows 10 Tech Preview, Windows 8.1, Windows 8, Windows 7, Windows Server 2019, Windows Server 2016, Windows Server Tech Preview, Windows Server 2012 R2, Windows Server 2012, or Windows Server 2008 R2. For details, refer to the Microsoft Lifecycle Policy.

How to run a scan

1. Download this tool and open it.
2. Select the type of scan that you want to run and start the scan.
3. Review the scan results displayed on screen. For detailed detection results, view the log at %SYSTEMROOT%\debug\msert.log.

To remove this tool, delete the executable file (msert.exe by default).

For more information about the Safety Scanner, see the support article on how to troubleshoot problems using Safety Scanner.

Related resources

• Troubleshooting Safety Scanner
• Microsoft Defender Antivirus
• Removing difficult threats
• Submit file for malware analysis
• Microsoft anti-malware and threat protection solutions