Microsoft has released a free security tool in addition to Microsoft Security Essentials. This new tool is a stand-alone Malware scanner called Microsoft Safety Scanner. The scanner is a 70 MB download, and it expires ten days after you download it. The scanner is also made to be run on a specific version of Windows. If you download the Windows 7 scanner, you can only use it on Windows 7. If you want to run it on Windows XP, you will have to download it from Microsoft's website using the computer with Windows XP installed. I performed a quick test of Microsoft Security Scanner on three laptops that had been scanned with Malwarebytes, and the scanner found threats on two of the three machines.

Here is the download: