Here is the KB article referencing the recently released hotfix rollup for System Center Essentials 2007 http://support.microsoft.com/kb/943111/en-us

Also see my previous post on the subject here http://blogs.technet.com/cliveeastwood/archive/2007/09/28/system-center-essentials-post-rtm-hotfix-rollup-released-to-the-web.aspx