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Task Scheduler in Windows 7/Vista store the tracked events for each task, which can be viewed by opening the task properties and clicking on the History tab. The entries are stored in the Microsoft-Windows-TaskScheduler event log. To clear the events history for all tasks, use the instructions in this article.
Click Start, type Eventvwr.msc and press ENTER.
Navigate to the following branch:
Event Viewer (Local) / Applications and Services Logs / Microsoft / Windows / TaskScheduler / Operational
Right-click Operational and click Clear Log…
Click the Clear button.
This erases the task scheduler events history for all tasks.
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Why would anyone delete the history though? It’s very useful.