[iask]

There are a couple of things here from my POV, first - I would replace the head of their IT and any senior IT staff - who seem to look for the quickest-then-cheap solutions. Dumb ducks who don't spend the extra time understanding the importance of the infrastructure and the software they install. And also replace the service vendor, if they have one.

I've seen this happen time and again, where companies have some 3rd party service vendors who would install AV software on anything they can get their hand on, even a microwave or coffee machine - just to tell the client "my bill is expensive, but you can feel secure, we installed AV". I despise these folks with a passion.

The problem is not Windows. It's a lack of knowledge and understanding. Simple.

For god's sake - it's 2016 - dump the Anti Virus software. I am gonna make t-shirts this summer with this ;)

[technion]

    I would replace the head of their IT and any senior IT staff 

It's a very good bet the senior IT team were following orders from somewhere else in the chain here.