Yeah, anti-malware apps like to fight with each other. It's good to have a second one to catch things that your main app might miss, but it absolutely can't be running automatically. The free version of Malwarebytes Anti-Malware is an excellent choice as a secondary anti-malware app. Besides the fact that it's competent at doing its job, the differentiation between free and paid is running automatically. There's no way that the free version will start running in the background without you knowing it. On the old machine, you might consider reformatting the hard drive and starting from scratch with a fresh Windows installation. After that, I'd remove any of the crapware included by the hardware vendor, check for unnecessary startup items, and shut off any unnecessary processes. If you decide you're in the market for a new machine, I'd definitely recommend the latest generation of Intel processors as they offer substantially better battery life than their predecessors. When I look at the machine that TheCrew07 linked to, two things come to mind. First, I'd bet that Mrs. 3K doesn't need an internal DVD drive. That adds both bulk and weight. An external drive can live in a drawer and pulled out for occasional use. Also, she may not need a 15 inch screen. 13 inches seems to be the sweet spot between real estate and portability for a lot of people.