The Windows Task Scheduler has been plagued by issues on Windows 8 and Windows 10.
This situation usually happens when you upgrade or downgrade, however, you havent done either arent completely excluded.
Click this post fromMiniToolto the methods to fix it.

It should also be related to the operating system you are using.
Most people should have this since its a common precaution to create a restore point before upgrading.
Here are steps to fix the corrupt Task Scheduler on Windows.
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Step 1:Typerestorein the Search menu and chooseCreate a restore point.
Step 2:ClickSystem Restorewithin theSystem Protectiontab.
Step 3:ClickNextto get the list of all available restore points.

Then follow through with the wizard, and Windows will cycle your PC to begin the restore process.
You just need to wait for the process to finish.
Then you should run Windows exactly as you did when you created the restore point.
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Step 1:TypeDate and Timein theSearchmenu, then pop swing open the result.
Step 2:Check theDate,TimeandTime Zone.
double-check theyre all set correctly.
The steps are as follows.
Step 1:TypeCheck for updatesin theSearchmenu and launch the result.
Then you will be inside theWindows Updatemenu.
Step 2:Then clickCheck for updates.
If theres an update available, Windows will detect it and you’re able to clickDownloadto download it.
Do you know how to recover lost files after Windows update?
This post shows you several methods to get them back.
It is used to discover and fix any potential Windows tasks issues, known as Repair Tasks.
you’ve got the option to download it on its official website.
you’re able to launch it when its installed, and it will fix your Task Scheduler issues.
Final words
This issue is one of many that Microsoft overlooked with their operating system.
However, there are some useful methods available for you.
Just try the methods above one of them will undoubtedly fix your corrupt Windows Task Scheduler.