Problems with avast grimefighter

I have a problem with avast grimefighter. I’ve had avast free antivirus for several years now and this had never happened. I turned up my laptop (acer aspire V5 with windows) and it goes directly to a screen that says “avast grimefighter” and starts loading “seddating your pc”. When the loading is complete, it goes to a black screen and nothing else happens. I didn’t ask to avast to install grimefighter on my laptop, which is strange because it just appeared when I turned it on. I have turned off and on my laptop several times with the power button but it ends on the black screen again. I do not know what to do since it doesn’t allow me to do anything. Please help

I didn't ask to avast to install grimefighter on my laptop, which is strange because it just appeared when I turned it on.
What avast version do you have? What build number?

More information that may assist:

Avast Clean Up formerly Grimefighter
https://forum.avast.com/index.php?topic=172405.msg1224373#msg1224373

I just know it is the 2016 version. I dont know which build number it is since i cant get into my laptop to check. No mouse, no safe mode, nothing. Just a black screen. If I press F12 before the avast grimefighter load screen, after is loads, the black screen shows some random letters ^[[24~ on the top left corner and I cant do anything else.

Check the boot order in your BIOS.