We’ve been seeing this error on our SBS 2008 servers regularly:
TaskScheduler 101 MM/DD/YYYY HH:MM:SS PM 1
Task Scheduler failed to start
"\Microsoft\Windows\CertificateServicesClient\UserTask" task for user
"Domain\Admin". Additional Data: Error Value: 2147942402.
TaskScheduler 311 MM/DD/YYYY HH:MM:SS PM 1
Task Scheduler failed to start Task Engine "" process due to an error occurring in "LUAIsElevatedToken" . Command="taskeng.exe" . Additional Data: Error Value: 2147942402.
We did some research and didn’t find anything conclusive, so we asked MS PSS about it and there’s a hotfix for it. PSS states that the issue can occur if the "Stop if the computer ceases to be idle option" is not saved for the task.
However, PSS recommends holding off on the hotfix unless the error is causing problems. They say the error can be safely ignored and will be corrected once the hotfix is officially released.