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,
Enter Safe Mode in Windows 8 Consumer Preview
In previous versions of Windows, it was always possible to troubleshoot problems by booting into Safe Mode by hammering on the F8 button on start-up - with Windows 8 CP, this process has become slightly more complicated. On first glance