Computer v slow speed plzz solved

[w_luck]

F=R=I=E=N=D=S

Mera masla ye hai k main avast ka antivirus download kiya hai aur jab main insttal karta hun to yahi error ata hai. screen shoot de raha hun.
aur maine new windows ki hai chalti chalti jagah bohut slow ho jati hai. itni slow k mouse ka cursor bhi kam nahin karta woh bhi slow chalne lag jata he.