This is the Windows Server Update Services support team blog. We cover all things relating to WSUS and Windows Update.
The MSRC folks say that they have revised the installation packages for MS10-015 with new logic that prevents the security update from being installed on systems if certain abnormal conditions exist. Such conditions could be the result of an infection with a computer virus such as the Alureon rootkit. If these conditions are detected, the update will not be installed and the result will be a standard Windows Update error.
They also state that they have also released a Microsoft Fix It as a standalone scanning tool that reports on the compatibility of a system with the MS10-015 update. The scanning tool can also be deployed through enterprise deployment systems allowing administrators to detect compatibility with the update before deploying broadly.
For all the details see http://blogs.technet.com/msrc/archive/2010/03/02/update-ms10-015-security-update-re-released-with-new-detection-logic.aspx
J.C. Hornbeck | System Center Knowledge Engineer