Boot Straight to the Desktop
With the release of Windows 8.1 you now have the option available to you to boot straight to the desktop instead of Metro. Follow the steps below.
Right click on your Taskbar and select “Properties.”
Click on the “Navigation” tab and then select “Go to the desktop instead of Start when I sign in.”
This was done as part of the Modern UI experience update. See all the improvements in the Technet article: What’s New in Windows 8.1.