Rui CarmoSmartClose (download) is a Windows application that enables you to quickly shut down all running applications and services, run what you need (some people use it for Quake, I use it for PowerPoint) and restore the system state afterwards:
SmartClose (download) is a Windows application that enables you to quickly shut down all running applications and services, run what you need (some people use it for Quake, I use it for PowerPoint) and restore the system state afterwards: