Microsoft Security Tools :MBSA , Malicious Software Removal Tool

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Microsoft Windows Malicious Software Removal Toolhttp://support.microsoft.com/?kbid=890830&SD=tech

Microsoft has released the Microsoft Windows Malicious Software Removal Tool to help remove specific, prevalent malicious software and supersedes all virus-cleaner tools that were previously released by Microsoft.

Key differences between the Malicious Software Removal tool and an antivirus product:
-It can only remove malicious software from an already-infected computer. Antivirus products are also able to block malicious software from running on a computer. It is significantly more desirable for malicious software to be blocked from running on a computer than being removed postinfection.

Platforms : Microsoft Windows Server 2003, Microsoft Windows XP, or Microsoft Windows 2000.
Download versionhttp://go.microsoft.com/fwlink/?linkid=40587
Online version
Microsoft Baseline Security Analyzer 2.0
Also check the MSSA ,meant for enterprises,and so on .MBSA 2.0 is an easy to use tool that can determine security state in accordance with Microsoft security recommendations and offers specific remediation guidance.
Advantages

-Severity Ratings
-Locally and remotely scan for Office XP or later security updates
-Added guidance for locating updates and necessary actions
-CVE-IDs for supported updates
-Improved help content
-Windows Server Update Services compatibility
-Automatic Microsoft Update registration and agent update
-Support for detection of updates on 64bit Windows and Windows XP Embedded

Difference between Microsoft updates and MBSA

Microsoft Update is a web site that can scan a single computer and indicate missing / needed updates and install them as a group.While MBSA allows multiple computers to be scanned for missing / needed updates at one time to corporate environments by providing remote scanning