Some ASUS users are having UEFI-related Windows update problems that may brick their systems. A few news sites have stories on this:
[…] KB3133977, a security update for Windows 7, has been identified as the cause for this problem. Following its installation, it forces Windows 7 to enable Secure Boot, even though it is actually not supported by Microsoft anymore. This eventually prevents the system from properly rebooting. Microsoft has clearly stated that it is in no way responsible for this predicament. Providing clarification, a company spokesperson stated that the problem occurs because of how Asus has created some of its motherboards with its own modified version of the Secure Boot feature. In other words, users facing problems in this regard will have to contact Asus directly to have the issue addressed. […]
http://tech.firstpost.com/news-analysis/a-microsoft-windows-7-update-is-bricking-some-pcs-with-asus-motherboards-313729.html
http://www.thecountrycaller.com/60295-microsoft-corporation-msft-windows-7-update-is-bricking-pcs/
http://www.pcper.com/news/General-Tech/Another-reason-not-use-UEFI-Secure-Boot
Firmware Security 