When you Shutdown or Turn Off your Computer, make sure to simultaneous press “Shift” Button.
Windows 98: If you hold the “Shift” key down while clicking on “Shutdown” button, your computer would restart without restarting the Windows.
Windows Vista: Select Start, then hover over the right arrow that is to the right of the padlock icon until the pop-up menu appears that contains “restart” as one of it’s choices. Hold down the SHIFT key while clicking on the “restart” choice.
Windows XP: Select Start. Select “Shut Down…”. Change the drop-down combo box under “What do you want the computer to do?” to “Restart”. Hold down the SHIFT key while clicking on the “OK” button.
Try this on your PC too.