Read Windows Security Protection History before clicking Allow

A Defender notification may mean a threat was blocked, quarantined, removed or still needs a decision. Those are not the same outcome. Open Windows Security yourself rather than a pop-up that pretends to be from Windows, and read the entry before changing anything.

Inspect the event​

1. Open Start → Windows Security → Virus & threat protection → Protection history. Select the recent item and check its threat name, affected file path, time and current status. Administrator access may be needed for details.
2. If it says Threat blocked, Defender says it blocked and removed the item. You normally do not need to click another action, but consider how the file reached the PC.
3. If it says Threat quarantined, leave it contained while you investigate. If it says action needed, choose Quarantine when you are uncertain. Do not select Allow merely to make the notification disappear.
4. Compare the detected path with a download, email attachment or program you knowingly installed. If the alert involved a file you never expected, delete the original download and check whether similar files or extensions appeared.

When to escalate​

A repeated detection after removal, an unknown executable in startup locations or unusual account activity deserves a full scan and a closer device review. A false-positive claim should be supported by the real publisher and, where appropriate, a vendor sample submission; a comment from an anonymous uploader is not enough. Microsoft's Protection History guide distinguishes the statuses. If the file already ran, our malware-removal guide offers a broader response. Note the detection details before clearing history so you can explain the event if you need help.