“0x8007042c” error message when you try to start Windows Firewall Content provided by Microsoft Applies to: Windows 7 EnterpriseWindows 7 Home PremiumWindows 7 ProfessionalWindows 7 UltimateWindows 7 Home Basic More Select Product Version All Products Symptoms When you try to start Windows Firewall, you receive the following error if the Firewall service is disabled or if your computer is infected with malware: 0x8007042c Resolution To resolve this issue, scan for and remove malware by following the steps in Method 1. Method 1: Scan for and remove malware Method 2: Start Windows Firewall Method 3: Start associate services More Information For more information about Windows Firewall, go to Windows Firewall.Microsoft offers Microsoft Security Essentials, a free security program that will help protect your computer from malware. For more information about Microsoft Security Essentials, go to Consumer Security Support Center. Last Updated: Jun 2, 2017 Need more help? Search No results Join the discussion Ask the community Get support Contact Us Was this information helpful? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.