There is no feature in Consumer products to wake up a machine to do anything, only an option in certain suites to shut it down once a scan is finished.
I'm not familiar with "Auto Maintenance Task Agent" - could you clarify what McAfee product(s) you have installed?
Look in both the Start/All Programs menu and your Control Panel > Programs and Features.
Also what OS is this? Is the machine in question in a sleep state only and not fully powered off?
The update issue is being fixed shortly by a patch that is slowly being released around the world.
Additionally it might be wise to scan for malware using Malwarebytes Free and AdwCleaner, both found under "Free 3rd Party Tools" in the last link below.
By the way, I amended the above post with some additional remarks.
Toronto ▪ Canada
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