Windows Defender
Error message when you try to update Windows Defender on a Windows Vista-based computer: "Error found: Code 0x80240029"
http://support.microsoft.com/kb/934562"Check for new definitions" warning after you install Windows Defender
http://support.microsoft.com/kb/915105The installation path may be shorter than the path that you specify when you install Windows Defender
http://support.microsoft.com/kb/925557How to manually download the latest definition updates for Windows Defender
http://support.microsoft.com/kb/923159Error message when you run Windows Defender: "Error Code 0x800106ba"
Error message when you try to start Windows Defender on a computer that you recently upgraded to Windows Vista: "Application failed to initialize"
http://support.microsoft.com/kb/935511How to troubleshoot definition update issues for Windows Defender
http://support.microsoft.com/kb/918355
"common error codes are 0x8024402f or 0x80240016"
"Other errors: 0x8024402c, 0x80240022, 0x80004002, 0x80070422, 0x80072efd, 0x80070005, 0x80072f78, 0x80072ee2, 0x8007001B"Vista - Windows Defender
Turn Windows Defender on or off
http://windowshelp.microsoft.com/Windows/en-US/Help/31d797aa-091d-4d67-a556-dbfaf21bf0dc1033.mspxUsing Windows Defender
http://windowshelp.microsoft.com/Windows/en-US/Help/4ef8da25-133e-4947-99c1-5c7951d48a151033.mspxUnderstanding Windows Defender real-time protection
http://windowshelp.microsoft.com/Windows/en-US/Help/8b8917f4-88c7-4470-88ae-0a06987c20fd1033.mspx
Newsgroup for Windows Defender:
http://www.microsoft.com/athome/security/spyware/software/newsgroups/default.mspx
Microsoft Malware Protection Center
Threat Research and Response
http://www.microsoft.com/security/portal/