[Ctrl]-[Alt]-[Del]
OR...
Pull the power cord, then unplug the network line (ethernet, dsl, etc.)...
Then reboot into Safe Mode and allow the computer to recover and check all drives. Then reboot again (without connecting the network cable) and uncheck the “allow win10 upgrade” popup box.
Shutdown, connect cables, power up and search for something called Never10 (I think. Someone will chime in in a bit and point it out).
Oh, and of course look for a- ... -an alternative Operating System such as Linux as soon as you can realize what others already have: u-squish (MS) is still actively looking for a way to force you to “upgrade” one way or another. It is only a matter of time until you are assimiliated.
Go Linux.
Or Apple, if you absolutely have to. To each his own.
***power up and search for something called Never10 (I think***
Yes it is Called GRC Never 10.
https://www.grc.com/never10.htm
I had to use it when a flash upgrade made an override of my previous Config file changes that stopped windows updates.
The nice thing about the little program is that it can also remove any windows 10 related software downloads remaining on your computer. I had over 6 Gig of windows 10 files downloaded that were removed by this program.
Linux cinammon mint 17.2 is excellent.
Cobbled together an old pc. Single 64bit athlon, 4g ram, gt610 vid card. And it runs better than any windoze box that has dual proc.
Really like Linux.
I no longer do that with running computers. Last time I tried it, a hard drive died.
power up and search for something called Never10
Yes, Never 10 was created by the great Steve Gibson of Spinrite fame:
https://www.grc.com/never10.htm
"Hiding" Windows 10-related Windows updates such as KB 3035583 worked for a while to block the upgrade, then in a substantial breach of ethics Microsoft started overriding the "hiding." So if you don't want 10, forget hiding updates, go with Never 10.
That said, while I am starting to hate Microsoft, I actually like Windows 10, except for its privacy violations. It has been perfectly stable, and has some nice new features.
To thwart at least some of Win 10's spyware activities, I like "Shut Up 10," from https://www.oo-software.com/en/shutup10. I say "some' because Microsoft's new OS is designed to phone home, and it can probably find ways to do so.