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The security permissions for the Task Scheduler have become corrupted.
Do this process
- Stop the Task Scheduler Service (run => services.msc)
- Delete or Move the file from the"C:Documents and Settings-All Users-Application Data-Microsoft-Crypto-RSA-S-1-5-18" folder.
- Start the Task Scheduler Service.
- Edit each previously scheduled task and provide security credentials for the task to run under.
- Right click the task and choose run.
The task should run correctly and it should also run as scheduled. If not, check the log file for more details.