Normally, if you have updates set to "Check for updates but let me choose whether to download or install them", it performs the task when you first boot up your system.
If you have updates set to "Install updates automatically (recommended)", it checks on boot up as well as the schedule you have specified.
Note: Be sure that the process isn't scvhost.exe (notice it's scv not svc). I was infected with that virus before and just decided to format/fresh install. It was very annoying and hard to get rid of.





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