"The selected task... no longer exists" for almost all tasks (Win7)

I opened the Task Scheduler in Windows 7 the other day and received dozens of separate messages, telling me that the tasks no longer existed. This included not only those that I created myself, but also for programs installed and crucial tasks of Windows System. The Scheduler is running and knows the names of tasks, such as confirmed by the command line.

I looked at the entrance to register TaskCache and it seems that only 4 tasks remain in it - a random selection that includes one of McAfee, two Google Update and Windows Defender. No other tasks that have xml files in the task (C:\Windows\System32\Tasks) folder are listed.

I read that these errors can be resolved by emptying the jobs directory of all files except those appearing in the registry and then re-import all the. I tried this for a single task that I created myself, and it succeeded. The fact for all tasks would take a very long time, but there is another problem: the Windows themselves tasks do not appear in the registry and I can't move or delete the Windows subdirectory under the task (C:\Windows\System32\Tasks\Microsoft\Windows) folder, even when I start a cmd as administrator session.

Any suggestions or advice welcome. Thanks in advance.

Hello

Thanks for posting your query in Microsoft Community.

Important: problems can occur if you modify the registry incorrectly. Therefore, make sure that you proceed with caution. For added protection, back up the registry before you edit it. Then you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click on the number below to view the article in the Microsoft Knowledge Base: How do I back up and restore the registry in Windows

In addition, it seems that you use several security software. Windows Defender is automatically disabled when using any 3rd party security software. Thus, the problem you are having, could be due to a conflict between the 3rd party software.

Step 1: Therefore, I first suggest you put the computer in a clean boot state and check if the same behaviour arises.

To help resolve the error and other messages, you can start Windows by using a minimal set of drivers and startup programs. This type of boot is known as a "clean boot". A clean boot helps eliminate software conflicts.

Place your system in the clean boot state helps determine if third-party applications or startup items are causing the problem. You must follow the steps in the article mentioned below to perform a clean boot.

How to perform a clean boot in Windows

Note: see 'How do I reset the computer to start normally after a boot minimum troubleshooting' to reset the computer starts normally after troubleshooting.

Step 2: Please refer to the suggestions in the help of TechNet support to solve problems in Task Scheduler.

Troubleshooting Task Scheduler

Step 3: Run the System File Checker tool

System File Checker is a Windows utility that allows users to find corruptions in Windows system files and restore the damaged files.

Press the Windows key + X , and then click prompt (Admin)

Type the following command and press enter

sfc/scannow

Note: Do not close the command prompt window until the audit is completed 100%. The results of the analysis will be posted when this process is complete.

Hope this information is useful. Please feel free to answer in the case where you are facing in the future other problems with Windows.

Tags: Windows

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