Hi Ellen, This is Ramesh.
The Task Scheduler service is an auto-start service and is supposed to be always running. If you're seeing the message "The Task Scheduler service on Local Computer started and then stopped.", it could be due to incorrect configuration of Windows services.
Please try reinstalling Windows 10 using the Media Creation Tool.
Download the Windows 10 Media Creation Tool.
https://go.microsoft.com/fwlink/?LinkId=2265055
Run the tool. Read and accept the license agreement.
Choose "Upgrade this PC now".
Follow the on-screen instructions and complete the repair installation.