Grimefighter doesn't destroy hardware, nor does any other software.
It simply can't.
If Grimefighter changed things that you don't want, run it again and undo the changes it has made.
If that fails, follow the instructions here:
https://forum.avast.com/index.php?topic=53253.0Start at "If you cannot Boot the computer"
If you want the money back that you paid for GrimeFighter...
Use the search option, it has been explained a huge amount of times already on how to ask for it.