I was watching youtube and my computer screen went black [READ MORE]

After using safe mode to open up avast since my Normal windows account would always be black screen

[ Basically when i was trying to login to my windows account without safe mode, i logged in and screen went black ]

Anyways, after starting avast on safe-mode, it said avast Unsecured, it was off or stopped, i tried clicking Start Program, Fix now, etc.

I was watching a youtube video as i said, after switching to another video on the YouTube.com site itself, my computer was on, but the screen went black, i shut-it-down using the Power button, i started up safe-mode, tried using the avast as said before, now i restored my system, but it went black again, so i had restore to like 10 Days ago, losing alot of Video-Game progress and a-lot of files.

Does anyone know how to fix avast, if there is one thing that matters on my computer, that is avast! and Google Chrome.