Restart windows without restarting your PC

If u Install An Appz And Ask For Reboot Just Use This And U Can Use Ur Appz Without Restart

this works both with windows vista and xp.
so heres the trick..

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.