MS Security Essential Install error 0x80070643

Hi. I have tried to Install Microsoft Security Essentials but I get the error 0x80070643. I unistalled Avira first, then rebooted before trying. Please help !

  1. Click Start, click Run, type Notepad, and then click OK.
  2. Type the following commands in Notepad. Windows Registry Editor Version 5.00


  3. On the File menu, click Save As.
  4. In the Save in list, click Desktop.
  5. In the File name box, type LoggingOff.reg, click All Files in the Save as type list, and then click Save.
  6. On the desktop, double-click the LoggingOff.reg file to remove the registry values from the Windows registry.
  7. Click OK in the message box.
  8. Delete the LoggingOn.reg and LoggingOff.reg files from the desktop
Contact Microsoft Support for help, and reference this Microsoft Knowledge Base article when you speak to the support agent. For more information about how to contact Microsoft Support, visit the following Microsoft Web site: Contact Us (Contact Us)

Also, check out this site for more information:
Source: You receive error code 0x80070643 or error code 0x643 when you use the Windows Update or Microsoft Update Web sites to install updates

I hope this helps!

Brett M,
Windows Outreach Team

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