100% DISK USAGE

Dear team, i buy Avast premier.
my program version is 17.4.2294(Build 17.4.3482)

My system is
intel core i7-2720QM CPU @2.20GHz
RAM 16 GB
64 -bit operation system

windows 10 pro

up to 30 minutes my system Disk usage is 100% after that it will be reduced up to 2%. while i am searching in google most of the answers are recommend to uninstall Avast.

Do i have to uninstall the avast or your will fix this issue.

What do you mean ?
100% memory usage, 100% CPU usage, 100% disk usage or… ?

Sorry 100% disk usage