From Totalidea Software:
8StartButton is a full start button with a full new designed start menu. Access the new 8StartButton start menu, the Windows 8 apps screen, or the Windows 8 start screen with a regular left mouse button click. You can customize and personalize your start button with in-build images, or use your own button pictures. It offers full control over Windows 8 with the included quick access menus to shutdown and restart, and additional Windows features. 8StartButton runs as a system service for best performance. It integrates itself into any new user account automatically and does not require a lot of CPU usage and RAM.