I just spent the last couple of hours learning my lesson the hard way and wanted to share my experience.
I run Win8.1 and have set my Windows Update to notify me, so I can install the updates manually and insure they get installed properly.
This morning when I performed the update, I noticed too late that the update started to install Windows 10. I have elected to install at a later date, but couldn't figure out what was going on.
Come to find out that I overlooked the Optional updates. MS has elected to include Windows 10 as an option update, and it was selected by default.
Anyways, I stopped the download and proceeded to install the other updates. Wrong. Each time I rebooted, the Windows 10 download resumed despite unchecking the update and hiding it.
I ended up doing a system restore back to Sunday night. This time I insured the Windows 10 option was deselected and hidden, before resuming the install of the Win8.1 and MS Office updates. Had to do the same process on the wife's Win7 laptop.
What a pain..
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