Scam re Trojan level 5 infection alert locking my MacBook Air

Hello Vladkvjatkovski,

Thanks for participating in the Apple Support Communities.

It sounds like you may have a pop-up window acting as a phishing attempt, so let's see if that's what is occurring.

Check out the following resource for more details on how to block pop-up ads if you're using Safari on your MacBook Air: About pop-up ads and windows in Safari - Apple Support

Check Safari settings and security preferences

Make sure Safari security settings are turned on, particularly Block Pop-ups—for pop-up windows—and the Fraudulent Website Warning.

On your iPhone, iPad, or iPod touch, go to Settings > Safari and turn on Block Pop-ups and Fraudulent Website Warning.

On your Mac, you can find these options in Safari > Preferences. The Websites tab includes options to block some or all pop-up windows, and you can turn on fraudulent site warnings in the Security tab.

If you're seeing this appear from an email instead, you can report this to reportphishing@apple.com. For more details on phishing attempts and reporting them, take a look at the following resource instead: Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

We hope that's able to help.

Have a great day!

Our pleasure, Vladkvjatkovski.

Have a good one!