We are trying to run Windows Updates on a Windows Server 2008 R2 server. When we start the process the system immediately returns the error message of ... An error occurred when checking for updates on this computer. Code 802400E Windows Update encountered an unknown error. The most recent update that got installed was Hotfix for Windows (KB947821) on 3-24-14. Prior to that the most recent update was Security Update (KB2813170) on 6-19-13. The bottom line is that we're trying to get the Dot Net Framework 4 installed. That's when we found out that updates were not running.