hi
read this information about defender:
· if you are using microsoft security essentials avg norton mcafee avira etc they disable the vista version of windows defender by default
microsoft security essentials has its own version of windows defender
and other anti-virus programs use their own particular type of spyware and malware application scanner
it is nothing to worry about and is the default action that is designed for them to do
if the above does not apply to your machine read the information at the below link on how to either disable the windows defender service in vista or make it automatic startup to enable it
and here is the method to remove it from startup in vista
http://www.groovypost.com/howto/microsoft/vista/remove-windows-defender-from-vista-system-startup/
and here is how you would normally enable or disable windows defender in vista from within defenders own tools and options
http://www.groovypost.com/howto/microsoft/vista/disable-windows-defender-for-microsoft-vista/
and read this microsoft information:
Error message when you run Windows Defender: "Error Code 0x800106ba"
http://support.microsoft.com/kb/931849
and if you need to change startup programs read this information about the other methods to do that without using defender
using msconfig read this tutorial;
How to use MSCONFIG in Windows Vista
Here is how to use MSCONFIG in Windows Vista to disable some of the unnecessary programs that automatically load on start-up
http://netsquirrel.com/msconfig/msconfig_vista.html
and also try this program;
This utility, which has the most comprehensive knowledge of auto-starting locations of any startup monitor, shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them. These programs include ones in your startup folder, Run, RunOnce, and other Registry keys. You can configure Autoruns to show other locations, including Explorer shell extensions, toolbars, browser helper objects, Winlogon notifications, auto-start services, and much more