Bug::If you using Avast Internet security and using windows 8, then you should be having trouble getting your windows logged in.
Its a new bug if you're having a Microsoft account linked with your machine. The anti virus basically blocks you from logging in and there you have it. A black blank screen. So what's happening???? Do we have a solution???
The Problem:: The behavior shield feature in the anti virus is blocking you and your own computer it exists on. This seems to be a bug in the Anti virus feature.
The Solution:: Well the solution is pretty simple. Turn off the behavior shield feature And you're good to go.
Lets hope the team fixes the bug soon.