For more info, see How can SmartScreen help protect me in Microsoft Edge?

If you're using Microsoft Edge, make sure SmartScreen is turned on - SmartScreen in Microsoft Edge helps protect you from phishing and malware attacks by warning you if a website or download location has been reported as unsafe. The pop-up blocker in Microsoft Edge is turned on by default. A pop-up blocker can prevent some or all of these windows from appearing. Although most are created by advertisers, they can also contain malicious or unsafe code. Use a pop-up blocker with your internet browser - Pop-up windows are small browser windows that appear on top of the website you're viewing.

For more information see: Protect yourself from phishing. It's best not to open any attachment unless it's something you're expecting. If you install two anti-malware apps from other companies, however, they might both try to run at the same time.ĭon't open email messages from unfamiliar senders, or email attachments that you don't recognize - Many viruses are attached to email messages and will spread as soon as you open the attachment. If you install an anti-malware app from a different company, Microsoft Defender will automatically turn itself off. Running multiple anti-malware apps at the same time can cause your system to be slow or unstable.

Antimalware de microsoft