Note: The Microsoft Safety Scanner expires 10 days after being downloaded. To rerun a scan with the latest anti-malware definitions, download and run the Microsoft Safety Scanner again.
The Microsoft Safety Scanner is not a replacement for using an antivirus software program that provides ongoing protection.
For real-time protection that helps to guard your home or small business PCs against viruses, spyware, and other malicious software, download Microsoft Security Essentials.
Download Microsoft Safety ScannerIf you are unsure whether your computer is running a 32-bit version or 64-bit version of the Windows operating system, please visit Microsoft Support.
Note: Microsoft Safety Scanner expires 10 days after downloading. To re-run a scan with the latest antimalware definitions, please download and run Microsoft Safety Scanner again
Need to run on a different PC? Select your version.
Have a safer PC and web browsing experience
Genuine Windows customers get a complimentary subscription to Microsoft Security Essentials, the award-winning antivirus software that helps you protect your PC.
Get the latest version of Microsoft's more secure browser with SmartScreen Filter, which helps you avoid socially engineered malware phishing Web sites and online fraud when browsing the Web.
With Windows Live Family Safety, you can help keep your kids safer on the Internet with rules you personalize. You also can get tools to help monitor what they are doing online.