stellarsue Said:
”Purchased a new 2019 MacBook Pro a few days ago. Do I need anti-virus/malware software?[...] I had a window pop up two days ago saying that I had a virus....”
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No. Any Such software is useless for a Mac.
As for this Popup Message:
A Web Site Popup Message is HTML Code:
If you were on a Web site when this popped up, then it is no more than a part of the HTML code compiled for the Web site. A Web site is a file. There is nothing application about it, so to speak.
MalwareBytes for Mac:
Being that this is a scam, If there is any item out there that is trustworthy when it comes to Mac, it is MalwareBytes for Mac. This software looks for malware (malicious software), which makes your Mac act in a malicious manner. So, try it. It is created by longtime users of these forums. So, that is what makes it trustworthy. Get it here: MalwareBytes for Mac