This is my second time trying avast

And this time I installed it and did these steps
In the video to fix black screen
Www.youtube.com/watch?v=_PGvpwahhTY
And now computer won't even get started ...
It load up and then show "pc ran into a problem and it collect data and restart and ask to restore ..
And when I said yes to restore it won't do sh*t .....
I regret Installing avast .....
I used avast when I was 10
Years old on my Windows's xp computer .
And windows 7 . Then vista . Had really good experience .
But now .... Sad customer .