Right-click the Start menu button, then choose Properties. From the Taskbar & Start Menu Properties window, click the Customize button, then click the Advanced tab. You should see three options for Control Panel:
1. Display as Link: (default)
2. Display as Menu: When you click it, or hold the mouse over it, the
3. Control Panel items will open as a sub-menu.
4. Do not display this item: This will remove it from the Start Menu completely.
Or, if you want to view the Control Panel in a separate window, just right-click Control Panel and select Open. The Control Panel will now open in a new window and the behavior of your Start Menu will be unchanged.