As of January 2018, my blog contains posts regarding this question, pointing to articles by PC World and test results from independent anti-virus test organizations.
Basically, I recommend using mainstream computer security software like Norton, McAfee, etc.; or, with Windows 10, at least Microsoft’s built-in (free) Windows Defender. And Malwarebytes Anti-Malware (at least the free version).
If you require a “Made in the USA” computer security program, note that there are limited choices.
Note: Cnet January 31, 2018: “Windows will rid your computer of deceitful cleaners.”
Windows Defender will soon delete programs that trick you into paying for a service with alarming messages about the health of your computer.
You’ve likely seen deceitful cleaning or optimizing software in action. After reportedly scanning your computer, this software finds lots of problems, then asks you to pay big to get those problems removed. It tells you your computer is at risk if you don’t cooperate. Thankfully, Windows is going to target and delete those very programs in a March update.
Detecting such “scareware” is a useful update to Defender, something which Malwarebytes Anti-Malware (MWB) has done for years. MWB classifies such rogue software as PUPs (potentially unwanted programs) and also handles PUMs (potentially unwanted modifications).
Posted in: Microsoft Windows