There is MANY & many people have stuck with the first one they chose. Not really checking them ALL out and some take a lot of time and memory to do the same checks the one with less BLING can do faster. Try them out and see which one just works in the background all the time and does not bother you...with questions. I prefer the mechanic to fix my car and not ask "should I also do"? Like I know eff all about how the car works, just use YOUR best judgement so the car does not cause me problems...the computer AV should work automatically the same way.
One truth to it all, so long as MS is giving your computer UPDATES then the AV also get that latest in MS updates regarding weak spots in the programming. Many AV are actively writing AV programming for MS...so basically like car companies...they all make the basic car. Which is better than walking. Besides Viruses is not the big threat right now. Denial of services is and they can hold your system for ransom. That is not a virus...it is a Malware program. Also Key loggers are a threat to take your Credit card numbers and your SSi number and banking info and info about you so they can hack into your banking. Banks are keeping abreast of that as best as they can.
Regulating what YOU do matters. If you tell everyone your password to get into your computer, someone will. While you are at it give them the keys to your house, car, bank account access and Beer in the fridge.
Opening junk Email is not a good thing to do. It is junk for a reason. Opening email from a mystery source is also not a good idea and click the link inside the email. It does not say it directly but is basically asking "Do you want me to wipe your information from your computer"? Yes No
If you clicked on the yes then you asked for it. That program has your authorization to wipe your hard drive clean (now it is basically NOT ALLOWING YOU ACCESS TO THE INFORMATION UNLESS YOU PAY THEM MONEY (so Ransomware)
Hospitals in Britian were caught this way because they were still using XP and there was a hole in the programming that allowed it to be controlled by someone else...when someone allowed the program to run.
You got to use common sense. It is like getting Junk Mail at the front door, and some mail says you should pay them $10.000 BECAUSE. Will you do it...? No. You will not respond. For the 1% of the people that just click YES, it pays to run this on the internet...to the millions of computers because 1% is still a lot of people.
Using your brains and read the email helps to see it is from somebody you know.
There is no program that protects "AGAINST STUPID"
Free A V catch96% of the viruses.
And no the Porno Industry cannot afford to have viruses in their programs as they are one of the few industries that is making money on the internet. So why ruin their chances. More often it comes in the form of Email attachments...that you open.