After an in-place upgrade from Windows 7 to Windows 10, Task Scheduler always comes with error popups for many tasks. "Task X: The task object version is either unsupported or invalid." After closing all of them, I can get into Task Scheduler but I can't see any of those tasks apart from any newly created ones. I can't even see the system tasks. I tried deleting them by hand from regedit but that proved very tedious and unreliable. How could I reset the Task Scheduler without resetting Windows altogether? This has been bugging me for a while now but I can't figure out how to fix it. Anyone else having similar problems?