Microsoft Safety Scanner

Microsoft Safety Scanner is a free virus scanner similar to Windows Malicious Software Removal Tool that can be used to scan a system for computer viruses and other forms of malware. This program was released on 15 April 2011, following the discontinuation of Windows Live OneCare Safety Scanner.
Microsoft Safety Scanner is not meant to be used as a day-to-day tool, since it does not provide real-time protection against viruses, cannot update its virus definitions and expires after ten days. On the other hand, it can be run on a computer which already has an antivirus product without any potential interference. Therefore, it can be used to scan a computer where there is a potential infection and the user wants a second check from another antivirus. It uses the same detection engine and malware definitions that Microsoft Security Essentials and Microsoft Forefront Endpoint Protection use.
License restriction.
, part of Microsoft Safety Scanner's end-user license agreement which restricts its use reads: