<A target="_blank" href="http://www.networkworld.com/news/2011/052711-new-malware-scanner-finds-5.html?source=nww_rss">Microsoft's new Safety Scanner tool has been downloaded more than 400,000</A> times since its release. The findings, reported to Microsoft's Malware Protection Center (MMPC), indicate one in 20 PCs has at least one malware exploit installed.