Avast GrimeFighter

Avast GrimeFighter wants me to make a subsciption so I can get rid of 16 problems slowing my computer down.
The problem is I’m running a Windows 8.1 computer!
I want to get rid of the problems, but because according to the screen online, Grimefighter doesn’t support Win8.1
How do I get rid of them if I don’t have any idea what these programs are?

Alexander, the better now is to wait for the full compatibility with your computer.
They are “performance” problems, not infections, viruses or malwares. Don’t worry. Keep in contact and welcome to forums.