I just installed “Security Update for Windows Services 3.0 x 64 KB2596911” on a clients SBS 2008 server, as 1 of 6 updates, only to have it fail. Upon reboot neither Sharepoint website or the WSUS console were functioning. In addition the Application Event Log was full of Event ID 5084, Source MSSQL$MICROSOFT##SSEE informational events. A quick Google showed many folk have encountered similar issues, for example:
In my case after the reboot I was able to resolve by downloading the single update from the link below, right clicking and choosing run as administrator, and wait, and wait, and wait! Be patient, the update though small took about 45 minutes to complete but it was successful, and all services restarted. Though it did not prompt for a reboot I felt it was best to do so and everything still functioned properly.
For the record, there is no mention of it in the KB article, but during the install it advises that you need volume licensing to use the update. I choose to accept the notification and continue, working on the assumption the licensing referred to the base product. In my case this was being installed on Small Business Server where Sharepoint is an integrated component.
This may not be a solution in all cases, but it was a simple, though tedious, repair for this server.