Windows 7 has a troubleshooter taking care of power usage for notebooks as well as for desktop computers, it is quite hard to find however since you won't find it in your Control Panel's Power Options section. To access it,
Windows 7 comes with the Aero skin by default which might look nice but consumes a great deal of resources - and with them, power. I have experienced a loss of up to two hours of battery life on my
The reason to lock your screen (Windows key + L) usually is that you leave your computer, meaning it would be reasonable to turn off everything else there is on your computer as the sound or your screen as well.
Windows 7 comes along with a helpful command-line utility that lets you view your computer's power efficiency. It provides you with information about your processor utilisation, the processes taking up the most CPU resources, your current power plan and, if