When you open the Services management console (services.msc), the Task Scheduler service may be in a disabled state. In the Task Scheduler properties page, all the options may be grayed out, and the service Startup type cannot be changed.
Have you come across a situation where uninstalling software leaves its Service or driver entries in the registry, and Windows tries to load them at every boot, fails, and logs the error to the System Event log at every startup?
This article tells you how to delete an orphaned service in Windows 10 (and earlier) using the registry, SC.exe command-line, PowerShell, or Autoruns. Before proceeding further, create a System Restore Point and take a complete Registry backup.
If you find that no dependents exist for a service, you can delete the leftover or unwanted Service in Windows using one of the following methods.
When you attempt to start the Print Spooler service (via services.msc), one of the following error messages may appear, and the Print Spooler service fails to start:
Could not start the Print Spooler service on Local Computer. Error 1075: The dependency service does not exist or has been marked for deletion.