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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.