Windows defender definitions not updating
It will only pop up to inform you when it finds malware.
It won’t even ask you what you want to do with the malicious software it finds—it just cleans things up and quarantines the files automatically.
What you use is up to you, but Windows Defender is not a bad choice (and has overcome most of its problems from a few years back).
The “Scan history” screen shows you all current threats, plus information about your last scan.Antivirus definition updates automatically arrive through Windows Update and are installed like any other system update.These types of updates don’t require rebooting your computer.Windows 10 has built-in real-time antivirus named Windows Defender, and it’s actually pretty good.It automatically runs in the background, ensuring all Windows users are protected against viruses and other nasties. Starting with the Creators Update for Windows 10, Windows Defender’s interface changed a bit, and it was integrated into the new Windows Defender Security Center—which also provides access to security-related tools like family protection, firewall settings, device performance and health reports, and browser security controls.
With Windows 8, the product was tidied up a bit, bundled with Windows, and renamed Windows Defender. It’s true that other antivirus apps—like Bit Defender and Kaspersky—protect against more viruses in benchmarks. It’s by far the most non-invasive app, handling things in the background whenever it can and not nagging you all the time.