Applicable Versions: All

Note: This applies to pre Vista operating systems.

If you are running on Windows 8 or Server 2012 then see the kb After Upgrade to Version 5 all scheduled Tasks became Unsheduled. Attempts to set a time doesn't schedule them.

Possible causes and resolution:-

• Check that the Windows Task Scheduler Service is running. 
  If it is not the restart the service.
  
  
• Check if it possible for the user to create a Windows Scheduled Task. If the following error is displayed:-
  "The new task could not be created."
  "0x80070005: Access is denied. Try using the Task page Browse button to locate the application."
  
  The the cause will be a permissions issue with the c:\Windows\Tasks Folder.
  
  1. Open a Command Prompt
  2. Move to c:\windows
  3. Run the command below
     CACLS Tasks /E /G builtin\administrators :F
     
     This should reset the Access Control Lists and give full permission to the Administrators Group to the folder.