Posted 28 August 2012 - 21:24
Edit: Ok I known the cmd said it wasn't hardware related but...
Try unplugging your USB devices and network connection and try shutting down. Maybe something has a network share open? or maybe a USB device is hanging?
If no dice
From another known good computer burn a copy of Windows Defender Offline to CD or flash drive. Power off your system, insert disk, boot up the system and scan it.
If nothing shows up there... post a list of your installed software and try out DriverMax. Let's see what driver updates you have pending.