Does Defrag (scheduled weekly) close all apps on Windows 7

Does the scheduled defrag (In Control Panel -->Task Scheduler) shutdown all apps and a system restart?* I have found that I have been logged off in the morning and all apps closed, even code in the process of running.* I'm looking to disable any and all task that will auto log.* I have already disable several related to the so-called "Custom Experience Improvement Program".* That solved the problem but only for a couple of days.



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