I don’t want to use Avast so how can I unistall it?
How many years have you been here now and never seen/learned that?
Support: https://support.avast.com/
Scroll down to search for what you need and search for uninstall
The same as you would any other installed program in Windows.
Use the Windows Icon bottom left of your screen, Click that, Type add and from the selection, open it. Find Avast on the list, uninstall it.
You can choose to use the Avast uninstall tool. See here: https://support.avast.com/en-ww/article/10/?option=aps#pc
You know what K.I.S.S means
So how did it go?
And what AV are you using now … i guess you still use avast