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,
- open the Control Panel and enter System and Security.
- In the topmost Action Center section, select Troubleshoot common computer problems.
- In the last menu entry, System and Security, select Improve power usage.
By clicking on Advanced, all problems found will automatically be corrected. You start the process by clicking on Next - if there have been problems they will be displayed along with a notice if they have been corrected or not. Click on Detailed information to view all the points that the troubleshooter has messed with or not: