Since I've been talking to dottie about this, I thought I'd chime in on the mouse.
I use a Logitech wireless mouse and it's never caused me any trouble with a game...or anything else, for that matter.
Of course, there are mice and mice but if she has a Logitech wireless, I doubt that's the problem.
Do some AV programs really scan a game while it's being played? How odd!
"Best not to think about it. I don't want to fall to bits 'cos of excess existential thought."