Despite its cheesy name, its pretty decent, I either use it or Malwarebytes myself.
on Some PC's if have brought to me, I had to run it AND malwarebytes after fixing the major problems to get it all clean..stuff one missed the other found.
Its ok to leave on there, just maybe disable it on startup..otherwise your mom might click the "i want the pro trial' or whatever that button says on it. Then after 30 days it will start bugging her to buy it.
So just set it up to not run with windows, and scan every month or so with it manually..and your all good.
-We don't control what happens to us in life, but we control how we respond to what happens in life.
-Hard times create strong men, strong men create good times, good times create weak men, and weak men create hard times. -G. Michael Hopf
Disclaimer: Post made by me are of my own creation. A delusional mind relayed in text form.