please help i can not find my start button on my computer
OK, just to be clear - you're not talking about your computer's power on button, right?
And you're not able to see the Windows Taskbar on your screen when Windows is running?
Taskbar is that strip along the bottom which includes the Start Button (Windows Orb) on the far left.
If you move your mouse right down to the bottom of the screen - does that task bar become visible?
If so, you can right click on the Start Button (Orb), choose Properties. Choose the Taskbar tab.
Un-check Auto-Hide the Taskbar.
Check Lock the Taskbar.
Use the Apply button. And the OK button.
Now your Taskbar should always be visible.