In addition the KB article, I wanted to just post a few things to show what you can look for to verify that the update has been successfully installed on your clients.
Once the update is installed, you will see an additional hotfix located in your client source files.
Once the update is installed on your clients, you will see that the Software Updates Agent has been updated to 4.0.6487.2188
As of this blog post, the KB lists that the updateshandler.dll version should be Feb 01 2010, this is actually incorrect and will be fixed soon. Your updateshandler.dll will actually stay the same with a version of 9/18/2009.