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0X80070643 Can't complete Microsoft Security Essentials Installation Wizard

You may encounter the error message 0X80070643 Can't complete Microsoft Security Essentials Installation Wizard or 0x8004FF07 when attempting to install Microsoft Security Essentials.  First insure that you have removed any previously installed antivirus application using the appropriate antivirus removal tool.  Once that process has been completed, please follow the following steps:
  1. Install Windows Installer Clean Up Utility.
  2. Run Windows Installer Clean Up Utility.
  3. Highilght Microsoft Antimalware.
  4. Click Remove.
  5. Upon completion of the removal process, click Exit.
  6. Click Start - Run.
  7. Type: regedit
  8. Click OK
  9. Browse to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall.
  10. Delete the registry key entitled Microsoft Security Essentials.
  11. Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services.
  12. Delete the registry key entitled msmpsvc.
  13. Reboot.
You are now able to install Microsoft Security Essentials.

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