It's very simple. Installing (that is, of course for running) more than one AM cause to tension between them for protecting the machine.
PS: My thread was/is not about comparing the AMs. If anyone has forgot my issue. please goes to up and reads the title again.
Before you start admonishing people to:
"goes up to and reads the title again"
,please consider wording the title, and your "command" in a manner that makes sense.
However, since you're from Iran, I suppose that English is your second language, and you're doing the best you can.
First of all, no discussion about Windows needing an anti-virus, is ever going to slide through this forum without an argument about which is best. That's a given, period.
In certain very limited circumstances Windows does not need to have an AV product installed. If you never go on the internet, and scan every file, program, flash drive, whatever, with a good anti virus program BEFORE you put it on the machine without the AV, then no, you don't need an anti-virus.
If the machine is going to be used in an everyday computing environment such as going on the internet, downloading files, plugging USB drives from outside sources into the machine, then you should have an AV "solution" installed. If only for the peace of mind.
Since you seem to know quite a bit about the topic:
It's very simple. Installing (that is, of course for running) more than one AM cause to tension between them for protecting the machine.
It gives one pause to wonder why you're asking the question in the first place.
See if you get this, I've told you an AV product is likely needed. Many others have told you you should have it as well. Now, how many God damned answers do you think you need, or feel you're entitled to, before you either install an AV, tell us
"no thanks, it's not for me"
, or simply bow out of the thread?
An AV product isn't going to cost you any money, or cause a drastic performance drop.
I have an AV program on every machine I go on the web with.
And I have another policy, I will never, ever, go to the "malware removal" forum, and ask for help disinfecting a computer. If I screw up, I'll reformat the machine.
Now, I come to this forum for the social aspect of being with a group of people with similar intellects and interests.
But, at the end of the day, I don't care about you, or your computer, one bit.
I don't care if your computer gets infected, and I certainly have no intention of becoming a "malware helper", to a bunch of fools that think they can download whatever they feel like, go to any website they feel like, while not running any security software. Who, after they've hosed their machines by virtue of carelessness or stupidity, wind up begging somebody to bail them out.
And please don't tell me to,
"goes and reads the title again"
. It didn't make much sense the first time, and English done that poorly just pisses me off.