Re my case and Avira's kbid/1976: Tuesday night the KB4493509 installed. Next morning, when I got to the desktop everything kept freezing, I switched the power off, then on again and reboot. Same story again and again. a) When happen (Wednesday morning, April 10) the kbid/1976 not exist (Created : Thursday, April 11, 2019, Last updated: Thursday, April 11, 2019). b) Even if the kbid/1976 was issued in that time, how to perform the "Uninstall Windows 10 Update" in a frozen PC? (as I said my PC was frozen completelly, the tkbid/1976 applies only in case = "my system run very slow").