With Good Antivirus, Is It Still Safe to Use Windows 10 After Support Ends?

No! AV does nothing to truly protect an operating system without patches, you've simply been lucky as anyone can be until that luck ends and they're in far worse trouble if the outdated Windows device is used for anything important like banking, taxes, online retail purchases, etc.

However, since Microsoft is planning to provide their ESU (Extended Security Update) paid option to consumer with Windows 10 for the first time ever through October 2026, you don't have to even attempt this foolish and dangerous option for at least that one year.

Here's the general Microsoft Learn page for organizations about the ESU program, though the only mention on that specific page about the consumer offering is about a page down in the FAQ section I've dropped you into with the following link, and I've quoted below.

Extended Security Updates (ESU) program for Windows 10 | Microsoft Learn

"For individuals or Windows 10 Home customers, Extended Security Updates for Windows 10 will be available for purchase at $30 for one year."

Note that this offering hasn't yet been made available to consumers that I've seen and was planned to be shortly before the October 2025 end of support, most likely since some people will either replace their devices before that time with new Windows 11 ones, or their current Windows 10 devices might either fail or be lost, in which case Microsoft won't want to be processing refunds for lots of people who'd just never have paid in the first place if they'd known that would happen.

I actually saw a popup on one of my old Windows 10 devices bout this ESU option a few weeks ago, but unfortunately didn't take the time to read it fully since I was in a hurry and it closed when I tried to set it aside for later. However, that confirms what I'd thought that Microsoft will likely display such popups on the screens of those still using Windows 10 in the next few months that offers either upgrade options to Windows 11 if they apply or the ESU $30 option if not.

Rob

Common sense, good security habits, safe surfing, understanding security and safe computing are essential to protecting yourself from malware infection. No amount of security software is going to defend against today's sophisticated malware writers for those who do not practice these principles and stay informed. Knowledge and the ability to use it is the best defensive tool anyone could have. This includes educating yourself as to the most common ways malware is contracted and spread as well as prevention.

• Simple and easy ways to keep your computer safe and secure on the Internet
• Tips to help protect from infection

No single product is 100% foolproof and can prevent, detect and remove all threats at any given time. This means an anti-virus solution alone is not adequate protection since many types of malware and ransomwares will evade, circumvent and deactivate (disable) your anti-virus and security measures by design. Modern ransomware often involves targeted attacks which makes it less detectable to antivirus and other security software since these threats avoid the usual detection methods. Ransomware developers can evade an antivirus by changing the code, encrypting it or modifying the signature string. Cybercriminals can also use other (multiple) techniques which an antivirus may not protect may not protect against.

• For more details about the limits of an anti-virus, see my comments in this topic (Post #4).

You may also want to read Answers to common security questions - Best Practices for Safe Computing.