More sabotage:
Microsoft Botches Up UEFI Support for Windows 7 on ASUS Motherboards
"Microsoft inadvertently bricked a vast number of PCs running Windows 7, by changing the priority of an erroneous software update. Earlier this month, Microsoft changed the priority of an obscure-sounding security update for Windows 7 from "Optional" to "Recommended," (which by default gets automatically downloaded an installed). This update, KB3133977, bricks machines running ASUS motherboards, in the UEFI mode.
Windows 7 inherently does not support Secure Boot, a feature introduced with Windows 8, which takes advantage of UEFI to provide users with a layer of system integrity throughout the boot process. With KB3133977 installed on Windows 7 machines that use UEFI boot, the motherboard senses a Secure Boot violation, and invalidates the boot device (refuses to boot from it). ASUS recommended a BIOS setting with which you can deactivate Secure Boot while making your motherboard continuing to boot in UEFI mode."
"Security" updates and "Secure" boot make your system safe! It's for your security! Don't even think about running W7 without them!