My computer was working fine, and i decided to get online. I double clicked to open my browser (Opra) and it notified me that it needed to be updated. So i clicked update. Once the update was finished the computer needed to be restarted. When it came back up to the screen where you log in to a users side it wouldn't allow me to click on my name or any other. I then shut it down using the power button, and then turned it back on. this time i was prompted with the option to either start in safe mode or normally. i selected to start normally, and it just sat at the black screen with the "starting windows" bar loading at the bottom. it will not go any further than that. it's been three days now.