Access Denied Error in Windows Task Scheduler

If you find yourself trying to add, remove or modify tasks in Windows Task Scheduler and your logged in with proper credentials such as a domain or local administrator but Windows has decided you don’t have permission to do so and gives you the “Access Denied” error dialog, it’s most likely that someone or something (virus/malware) has modified the permissions on the %SystemRoot%\Tasks folder. There really shouldn’t be any  reason to modify these permissions so to reset them back to default settings for Windows Server 2003, enter the following command at the Command Prompt:

CACLS C:\Windows\Tasks /S:D:P(A;OICIIO;FA;;;CO)(A;;0x1200ab;;;BO)(A;;0x1200ab;;;SO)(A;OICI;FA;;;BA)(A;OICI;FA;;;SY)

For more information on the CACLS command line utility in Windows, visit Wikipedia.

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