https://www.cnet.com/news/microsoft-amd-spectre-meltdown-halt-chip-patches-pcs-unbootable-brick/ >Microsoft is putting critical Windows updates on hold after learning that some computers can't start up again after installing the patches.  >The updates to Windows included fixes for the Spectre and Meltdown flaws that made a device's central processing unit vulnerable to hacking attacks. The PCs that couldn't reboot had processors made by AMD, one of the three chipmakers whose products were affected by Spectre.