Help with shields.

I have a problem here.

Whenever I try to activate some of the shields nothing happens.

I tried reinstalling Avast with no luck.

I don’t know what to do ???

Got any other AV’s also installed currently, or recently removed?

Nope.

In fact, I don’t how this problem started.

I turned on my PC today and then there I saw the problem in Avast.

Try a repair first. Proceed as though you are uninstalling Avast! normally, but choose the “repair” option when it appears.