I'm running Windows 7 Ultimate as a developer box. When it starts, if I don't run any program, browser or app, it goes to sleep without any problem, but, when I start working on it, there's a moment when it starts getting awake forever. Even the monitor is on forever, it is never turned off. However, the sleep button works immediately.
I tried then
and I got this message
The Power Efficiency Diagnostic library (energy.dll) could not be loaded.
I searched for that dll and found it in C:\Windows\winsxs\amd64_microsoft-windows-energyefficiencywizard_31bf3856ad364e35_6.1.7600.16385_none_74c5223f50a58045 folder.
I tried also
and got this weird result
I couldn't determine yet the culprit of this, I had a similar problem with chrome some time ago but when I closed Chrome everything came back to normal, now it's not the case.
I'm using Microsoft Security Essentials as Antivirus and it's updated regularly by the way.
I can't find anything related on the internet, at least in Spanish or English which are the languages I can read. any ideas?