Cannot restart computer

Viruses and worms
1

I run a work from home business so my computer is very important for that. I installed the free avast anti virus and now my computer will not boot. I cant get it to do Anything!! It was working fine before now it is saying something about memory corruption and won’t boot.

2

Did you remove your previous used AV before installing avast?

Uninstall other AV > https://www.avast.com/faq.php?article=AVKB11#artTitle

Uninstall avast > https://www.avast.com/faq.php?article=AVKB10#artTitle

3

Yes I did but I cannot install or uninstall anything right now as it won’t boot up. I can’t do anything in the computer at all

4
I can't do anything in the computer at all
Repair shop next :'(
5

Can you still boot into safe mode…?

6

No. Not even safe mode

7

What OS/SP ?
What is giving the error message ? (bios/uefi or Windows)
What is the exact message ?