wu keeps offering KB905648

The little shield keeps appearing in the system tray, offering me
KB905648 (Update for Outlook Junk Mail Filter). I don't want to install
this update, so I unchecked the check box, and selected "Don't ask me
again" in the next window, but it keeps asking me again. Also, in IE7,
I selected don't ask me again (not sure if it will offer it again in IE7.)

We don't use Outlook here. I told it to not ask me again for the other
two Outlook updates, and it is honoring my request for those two.

Please help--this is annoying.

Jim