Restart Windows without Restarting PC

It’s really very very annoying to restart your PC everytime after you install some hefty applications. Ever thought how to get rid of this? Well most of us will never think of this and just stick to the default Windows Xp/Vista’s annoying reboot process.
Here is a trick involving tricking the PC do a “warm reboot,” rather than a “cold boot.” The trick involves holding down the SHIFT key when invoking the restart.
Windows Vista: Select Start, then click on the padlock button icon and from there, hold down the SHIFT key while clicking on the “Restart” choice.
Windows XP: Its pretty much the same. Select Start. Select “Shut Down…” Hold down the SHIFT key while clicking on the “Restart” button.