Or, if you are like me and have Windows Explorer pinned to the Taskbar, you can right-click the icon and then right-click the Windows Explorer menu item as shown.
You should now be looking at the Windows Explorer Properties dialog box. Notice the default target path (red arrow). That target path is what we are going to change.
To change the launch folder default in Windows Explorer, modify the target path to be this command:
%SystemRoot%\explorer.exe /e,::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
Be sure to type it exactly or it will not work and then click OK.
The next time you load Windows Explorer from that particular shortcut, it will launch in the system root directory as shown.
Keep in mind that this change only modifies that particular Windows Explorer shortcut. If you were so inclined you could copy the Windows Explorer shortcut several times and change the respective target folders to whatever you wished. What other folders would you put in that target box?
Resource from Techrepublic