[quote=moneymaker]Those claiming Defender is on by default may want to double check because that is what I read as well, but it wasn’t. So either a virus turned it off or it was never on by default. I personally feel that windows 10 saw McAfee on my system and therefore did not enable Defender. Only problem is I was not using McAfee and even if I was it is not compatible. I now have Defender turned on and scanning, it is taking forever to do a full scan! Microsoft doesn’t even make a registry cleaner, those don’t really work and will most likely just screw things up, I assume Combofix is a registry cleaner. 6 hours later my scan is about 2/3 done.[/quote]I just double checked and it is on for me without me manually turning it on.
You’re right, it might have something to do with your system having McAfee there. You’re also right that McAfee is not compatible. Neither is Norton. However, how can you have McAfee on your system and Windows 10 not telling you to uninstall it? It would be work as design if your system have McAfee, even if it’s not working properly. Since, I would expect Windows to turn off Defender when I install a 3rd party Antivirus software.
BTW, are you using mechanical HDD or SSD? I find that antivirus scan is drastically faster with SSD vs mechanical HDD.