Set up Microsoft Defender properly
Defender works out of the box, but a few switches are worth checking so you get its full strength.
Open Windows Security
Press the Start key, type Windows Security and open it. You will see a status for each protection area. Green ticks are good; any warning deserves a click.
Virus & threat protection
- Select Manage settings under Virus & threat protection settings.
- Turn on Real-time protection.
- Turn on Cloud-delivered protection and Automatic sample submission for faster detection of new threats.
- Turn on Tamper Protection so malware cannot quietly switch Defender off.
Ransomware protection
Open Ransomware protection and enable Controlled folder access. It blocks unknown programs from changing files in protected folders such as Documents and Pictures. If a trusted program is blocked, allow it under the same screen.
App & browser control
Open App & browser control and make sure Reputation-based protection and SmartScreen options are on. They warn you about risky downloads and sites.
Firewall
Under Firewall & network protection, confirm your active network profile shows the firewall as on.
Scans you should know
- Quick scan: checks the usual hiding places in minutes.
- Full scan: checks every file; run it monthly or after a suspicious event.
- Microsoft Defender Offline scan: restarts the PC and scans before Windows loads, which helps against stubborn malware.
Keep it current
Open Settings, then Windows Update, and install updates. Defender receives its detection updates through Windows Update.