The symptoms for this issue that your Windows 8 or Server 2012 pc runs slowly and applications lag. If you press CTRL+ALT+DEL and check the Windows 8 or Server 2012 Processes. Then you will see a process called tiworker.exe using around 50% of your CPU time. If you try and end this process the tiworker.exe automatically starts itself again.
After 30 minutes or so the issue will go as the tiworker,exe process will end. This process is used by Microsoft’s auto update services when downloading and applying updates to Windows 8, it runs an applicability scan hence why the process will restart when you kill it as it will run until it has checked if there are updates for applications you are running.
You may also experience the error 0x80004004 (E_ABORT) while running automatic updates or CBS_E_SOURCE_MISSING. This error has also been seen while tyring to install the application server role into Server 2012.
This issue was resolved with an update from Microsoft. See the link below.