I'm running Windows 7, and I get Error code 0x80070422 when I try to enable Windows Defender.
Possibly related: I also can't enable Windows Firewall (I select "use recommended settings," and nothing happens), and when I run the firewall fix it diagnostic from http://support.microsoft.com/mats/windows_firewall_diagnostic/, I get "we're worry, but the program encountered an error trying to contact the server. Please try again later. [Code 80092009]"
Any help would be greatly appreciated. Thanks!