Windows defender issue

[Dexter]

Hi can anyone help, I'm running windows Vista Ultimate but have a couple of
issues. First one is that I can't start defender at all, I can't update it
because windows says it's already part of vista and I can't figure out how to
uninstall it. The error message is 0x800106ba. Second issue is that I can't
change the windows update settings, I have administrator rights but can't
figure out how to change it, the options are greyed out.

Thanks

 

[Mark L. Ferguson]

Unable to enable Windows Defender application in Windows Vista:
http://support.microsoft.com/kb/555962

It's likely that the WMI repository is corrupt.

 

[GE]

Check this out

http://support.microsoft.com/kb/931849