Can Windows Defender remove viruses?

Yes, Windows Defender (now called Windows Security) can remove viruses, and it’s a lot better than it used to be. It’s built into Windows 10 and 11, it updates itself, and for everyday protection it does a solid job. For a long time people paid for antivirus that wasn’t much better than what they already had for free.

So why do we still see infected computers that had Defender switched on the whole time?

Where Defender does well

• It catches the common, known threats quickly.
• It runs quietly in the background without slowing everything down.
• It updates automatically, so it keeps pace with new definitions.
• It’s free and already there, nothing to buy or install.

For most people, keeping Defender on and Windows up to date is genuinely good protection.

Where it falls short

The catch is the same one every scanner has. New malware is written every single day, and there’s always a window before the scanners learn to recognise it. During that window a fresh infection can slip straight past.

The other problem is that scams don’t rely on tricking the software, they rely on tricking you. If someone talks you into installing remote-access software and handing over control, Defender sees a program you agreed to run. It has no way of knowing the person on the phone is a scammer.

The bottom line

Leave Windows Defender on, it’s worth having. But don’t assume a clean scan means a clean computer, especially if the machine is still misbehaving or you’ve had a suspicious phone call. That’s where a person who checks it by hand makes the difference. If yours isn’t running right, call 0477 319 160 and we’ll take a proper look.