How to Restart the Start Screen and Taskbar (Explorer.exe) in Windows 8.x
 

If your Taskbar, System Tray, or even the Start Screen starts acting up, you don’t have to power off or reboot your computer. You can usually just restart the Explorer process, and Windows 8.x makes that really easy.

Back in the Windows Vista or Windows 7 days, you could CTRL + SHIFT and then right-click on the taskbar to pull up a hidden option to close Explorer without loading Task Manager… but that doesn’t really help that much since you’ll have to re-open the process anyway.

http://www.howtogeek.com/179053/how-...n-windows-8.x/