My PC doesnt want to sleep. Why?

[rocks911]

I have a W7 64 bit PC that is ALWAYS on.
I have adjusted the power scheme to no avail, nothing seems to make a difference.

I have unchecked allowing the mouse to wake the PC because I know that any vibration can keep it awake.
I have not unchecked allowing the keyboard wake the PC cause I dont know how else to awaken it without a hard restart.

I know this sounds silly but this thing is on around the clock. What program(s) could be causing this?
I have an always on VPN but close my browser and everything else when I'm done but still when I come back its always on. Can Advanced System Care, Malwarebytes or ESET keep it on?

This PC is 4 years old and I would like it to power down when its not in use to lengthen the life of it but cant seem to manage it.

 

[richc46]

There are various reasons you may be having this problem. This tutorial for both Vista and Seven may help

Power Options and Sleep Mode Problems