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Get a free PC safety scan

Windows Live OneCare safety scanner is a free service designed to help ensure the health of your PC.

  • Check for and remove viruses
  • Get rid of junk on your hard disk
  • Improve your PC's performance

Windows Vista and Windows 7 users, try the Windows Vista and Windows 7 edition of the scanner.

Firefox users: see the special instructions for running the scanner using Firefox.

 

Fix specific PC issues

Use the full service scan to check everything. To help fix particular problems on your PC, turn to the individual scanners below.

Go to the Protection center
Protection
Go to the Clean up center
Clean up
Go to the Tune up center
Tune up


 

Top threats

  1. Exploit:HTML/IframeRef.gen
  2. Worm:Win32/Conficker.B
  3. Virus:Win32/Sality.AM

Heard about a threat?
Note: Some threat information is available only in English.
Microsoft Security Essentials

Get high-quality, hassle-free antivirus protection for your home PC now.

Microsoft Security Essentials provides real-time protection for your home PC that helps guard against viruses, spyware, and other malicious software. Download Microsoft Security Essentials.