Microsoft Safety Security Center. When necessary, Microsoft releases security updates on the second Tuesday of each month. We publish security bulletins to announce and describe the update. Occasionally security updates are released more often. Security update bulletins have two forms simplified and technical. The links below go to the simplified versions. To get technical details review the information published on Microsoft Tech. Net. Last Bulletin May 1. The Last Defender For Pc' title='The Last Defender For Pc' />In its last big update, the antivirus built into Windows gained new responsibilities and a grand new name Microsoft Windows Defender Security Center. The Last Defender For Pc' title='The Last Defender For Pc' />Windows 8 ships with a new version of Windows Defender thats supposed to offer the same level of protection as Microsoft Security Essentials. Windows Defender has risen from dead last in independent testing to somewhere in the middle, actually outperforming some paid competitors. Windows Defender, officially called Windows Defender Antivirus in Windows 10 Creators Update, is an antimalware component of Microsoft Windows. Get a free PC safety scan. Free tool will help remove viruses, spyware, and other malicious software. Windows 7 Ultimate 64 Bit Key Loader.