http://www.washingtonpost.com/blogs/the-switch/wp/2018/01/09/microsoft-pauses-amd-updates-for-spectre-and-meltdown-after-consumer-issues/

Microsoft has suspended sending some Windows updates to address the Spectre and Meltdown vulnerabilities after some people whose computers use AMD processors reported that their devices did not boot after installing the new patches.

“Microsoft has reports of customers with some AMD devices getting into an unbootable state after installing recent Windows operating system security updates,” the company said in a statement Monday. Microsoft appears to pin the blame on the faulty updates with the manufacturer. “After investigating, Microsoft has determined that some AMD chipsets do not conform to the documentation previously provided to Microsoft to develop the Windows operating system mitigations to protect against the chipset vulnerabilities known as Spectre and Meltdown.”