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PC Security

Security scanners, tools, and safety guidelines for your PC, laptop, or mobile device.

Microsoft Malware Removal

Malicious Software Removal Tool

Skip the details and download the tool

The Microsoft Windows Malicious Software Removal Tool checks computers running Windows 7, Windows Vista, Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software—including Blaster, Sasser, and Mydoom—and helps remove any infection found.

When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed.

New additions

We have added detection and cleaning capabilities for the following malicious software:

See the complete list of malicious software cleaned by this tool.

Microsoft releases an updated version of this tool on the second Tuesday of each month, and as needed to respond to security incidents. The tool is available from Microsoft Update, Windows Update and the Microsoft Download Centre.

Note The version of the tool delivered by Microsoft Update and Windows Update runs in the background and then reports if an infection is found. To run this tool more than once a month, use the version on this web page or install the version that is available in the Download Centre.

Because computers can appear to function normally when infected, it's a good idea to run this tool regularly even if your computer seems to be fine. You should also use up-to-date antivirus software, such as Microsoft Security Essentials, to help protect your computer from other malicious software.

To download the latest version of this tool, visit the Microsoft Download Centre.

You can also perform an online scan of your computer using the Windows Live OneCare safety scanner.

Get a free safety scan

To scan your computer for malicious and potentially unwanted software from a website, see the Windows Live OneCare safety scanner.

Windows Live OneCare safety scanner is an online service that you can use for free spyware removal. Use it to scan your computer to help protect, clean, and keep your computer running its best. Use the free scan to check for and remove viruses, spyware, and other potentially malicious software and to find vulnerabilities or shortcomings in your Internet security.

Protect your PC

To help protect your computer against a wide variety of security threats, see How to boost your malware defense and protect your PC.

Technical assistance

For technical support, please visit the Virus and Security Solution Center.