Fix Sihost.exe Unknown Hard Error In Windows 10/8/7

How to fix Sihost.exe Unknown Hard Error Windows 10. Issues addressed in this tutorial: how to fix sihost.exe unknown hard error windows 10 how to fix sihost.exe unknown hard error sihost exe unknown hard error fix Unknown Hard Error appearing in Windows 10 can be an unpleasant situation. The occurrence of it leads to sudden disappearance of Desktop icons, freezing of the taskbar and blackening of the screen. Every time you attempt to launch Windows, the system flashes a message stating that it’s a critical error and some applications (Start and Cortana) won’t work. Upon a bit of investigation, you find sihost.exe isn’t responding and this is responsible for c000021a Unknown Hard Error to appear. Sihost.exe files represent Shell Infrastructure Host which happens to be a core component of the Windows environment. It is this Windows Shell Infrastructure Host which is primarily responsible for handling several graphical elements of the OS interface like Start menu and taskbar transparency. This tutorial will apply for computers, laptops, desktops, and tablets running the Windows 10, Windows 8/8.1, Windows 7 operating systems. Works for all major computer manufactures (Dell, HP, Acer, Asus, Toshiba, Lenovo, Samsung).