Robbie upgraded to Windows 10, but he's having issues. Leo says that any Windows update can fail and that may be the case here. There is a way to reset Windows Update to go back to the previous version and try again. There may also be a registry key that is causing it, and Microsoft should have a Fix It utility that can get rid of it. GHacks.net has details on the fix for this as well.
The chatroom says that in Task Manager, turn off all non Microsoft services and then try the update again. But try resetting Windows again too. Leo bets all of this will be fixed with the Threshold 2 update next month.