How Each Free Antivirus Detects Computer Viruses In 2026?

Question

I noticed in many websites run by it's owners who claim that all free antiviruses in 2026 have equal detections of computer viruses and there's no point swapping the W.D./M.D.A. for the other free antivirus that's on offer?,and you would agree on that and no doubt would of put out such a statement yourself by stating the installed W.D./M.D.A. does indeed show a level playing field,but was shocked to discover in my case and possibly in other cases that the installed W.D./M.D.A. isn't showing to be on a level playing field,but it was like baseball with three strikes in a row, and it was then out,compared to a rival that always hit a home run.I always given the installed M.D.A. a chance it can score a home run on the first ball it hit,equally as it's rivals,but that still never happened?.I tested my installed M.D.A. on more than one occasion, by finding out how it would react? or not ?,after scanning one of my dangerous programs and oddly enough the M.D.A., wasn't all too bothered enough to give off an on screen alert nor remove it at any stage.I did the same experiment with another free antivirus and in that case it gave off an on screen alert and instant removal took place within seconds.I retried to download that very same program but it didn't go through ever,the installed rival free antivirus does not allow it, as shown on the screen.I don't know why the installed M.D.A. doesn't mind one bit on dangerous downloads that have been going through without getting any on screen warning alerts and not even get a warning after the computer virus was installed?.Clearly somewhere along the line/s?,something is missing?.

Answer 1

The effectiveness of antivirus solutions, including Microsoft Defender Antivirus (M.D.A.), can vary based on several factors, including the specific threats being tested, the configuration of the antivirus software, and the context in which it is used. Microsoft Defender Antivirus utilizes a combination of anomaly detection, machine learning, and cloud-delivered protection to identify and block malware. It is designed to monitor processes and files for suspicious behavior, which can sometimes lead to differences in detection rates compared to other antivirus solutions.

In your case, if you found that M.D.A. did not alert you or remove a dangerous program while another antivirus did, it could be due to several reasons:

1. Configuration Settings: The settings for real-time protection and scanning may not be optimally configured in M.D.A. This can affect its responsiveness to threats.
2. Type of Threat: Some antivirus solutions may have different strengths in detecting certain types of malware. M.D.A. might not have flagged the specific program you tested due to its detection algorithms or because it was not recognized as a threat at that moment.
3. Behavioral Detection: M.D.A. employs behavioral detection techniques that may not trigger alerts for all potentially unwanted programs, especially if they do not exhibit known malicious behavior immediately.

It's important to ensure that your antivirus software is up to date and that you are using it in conjunction with safe browsing practices. If you consistently find that M.D.A. is not meeting your expectations, it may be worth exploring additional configurations or considering other antivirus solutions that align better with your needs.

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References:

• Microsoft Defender Antivirus capabilities
• Why do I need antivirus and antispyware software?