I have a home network and notice that for the last 5 weeks I haven't been
getting any updates and have received the above error message on my Dell
Dimension E521 desktop; otherwise, everything is working fine. My last
successful automatic update was on 1/19/2008-Definition Update for Windows
Defender-KB915597(Definition1.24.5611.0).

Have tried everything, including checking the automatic configuration box,
but no luck.

I have another Vista computer which is receiving updates without any
problems and I've compared Internet Explorer 7 settings-all identical.

Does anyone have a solution?