New version of internet security stops my dell 7746 laptop from shutting down

When I shut down the screen goes black and all the lights go off. I unplug the battery charger and go to bed. The next day when I try to turn it on I have to hold the power button down for a while before it boots. Once it boots the battery that was fully charged the night before is almost drain down.

Now when I disable internet security before I shut it down it starts right up the next day and the battery is fully charged. I have done this many times so it points to Avast or a driver that is causing this problem.

If anyone has this or has a idea how to fix it please post back.
Thanks

What OS/SP ?
What exact version of avast ?
Any other security (related) software installed ? (or was there)
What is running (in the background) when you try to shutdown the system ?