Yes Derek, third party is not Microsoft's own and sometimes not compatible with Defender by design, they are all add ons or extensions and you certainly never needed 3 of them. If your system is a well maintained desktop with plenty of ram and a good hard drive you could get away with it. If you are running w10 you need none of them if you are taking sensible care about the sites you visit or to who you allow access to your mail. I have to wonder how it is when they are all popping up pressing the premium system, and giving you warnings about each other. A laptop must be at a standstill I would think. Myself? I would bin the lot and run with Defender, and if the adverts bother you a blocker. Free Malwarebytes can be installed, a scan run, and uninstalled if you think you have a real problem. You will only get a problem though if you open dodgy, links or visit sites that are unsafe and if Defender is switched on and you have the settings designated to, warn you before you enter a dodgy site. Just for info, I have used them all. Norton and Macafee were the worst offenders and I wouldn't touch a Russia, or Chinese site with someone else's pc.