9 Windows 11 Security Settings to Keep On in 2026
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- Keep these on: Microsoft Defender real-time protection, Tamper Protection, Firewall, SmartScreen, Windows Update, memory integrity (where available), UAC, device encryption or BitLocker, and Controlled folder access if you handle important files.
- Check them all in one place: open the Windows Security app from Start.
- Turn off a protection only briefly and only for a specific, trusted reason, then turn it back on.
Some Windows guides tell you to turn off security features to fix speed or install problems. In most cases that creates risk without solving the real issue.
This checklist covers nine built-in protections that are worth keeping on, where to find each one, and what it does in plain terms. It does not use scare statistics, because the protections stand on their own merits.
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1. Open the Windows Security App

- Click Start and type Windows Security, then open the app.
- The home screen shows a status for each area. A green check means no action is needed.
- A yellow or red icon means a setting is off or needs attention. Select it to see the fix.
2. Virus Protection: Real-Time and Tamper Protection

- Open Virus and threat protection, then Manage settings.
- Keep Real-time protection on. It scans files as they open.
- Keep Tamper Protection on. It stops other programs from switching off key security settings.
- Run a scan after installing software from an unfamiliar source.
3. Firewall and SmartScreen

- Firewall and network protection: keep Domain, Private, and Public profiles on.
- App and browser control: keep Reputation-based protection (SmartScreen) on for apps and files, and for Microsoft Edge.
- If you use a third-party antivirus, Windows may show different status. Make sure only one real-time antivirus is active.
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4. Device Security: Memory Integrity and Secure Boot

- Open Device security and look at Core isolation details.
- Turn on Memory integrity if your drivers are compatible. It helps block malicious code in the core of Windows.
- If it will not turn on, Windows lists the driver that is blocking it. Update or remove that driver.
- Secure Boot and TPM status appear in the same area.
5. Updates, UAC and Encryption

- Windows Update: keep automatic updates on. Many fixes are security patches.
- User Account Control: leave it at the default level so you see a prompt before apps make system changes.
- Device encryption or BitLocker: protects your files if the PC is lost or stolen. Check Settings, Privacy and security, Device encryption.
- Controlled folder access (in Ransomware protection) can block unknown apps from changing your documents. It may prompt for trusted apps.
Habits That Matter as Much as Settings
- Download software only from the developer’s official site or a trusted store.
- Use a unique password for each account and a password manager.
- Turn on two-step verification for email and banking.
- Keep regular backups, including one disconnected copy.
- Be careful with email attachments and links, even from people you know.
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Frequently Asked Questions
Is Microsoft Defender enough?
For many home users it provides solid baseline protection. Add safe habits: updates, strong passwords, and careful downloads.
Should I turn off SmartScreen to install a program?
Only if you fully trust the source. A warning is a signal to check the download, not to disable protection.
What does Tamper Protection do?
It stops apps and users from changing key Microsoft Defender settings without proper rights.
Do I need BitLocker?
Encryption protects data on a lost or stolen device. It is available on many editions, and device encryption may be on by default on newer PCs.
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Related Guides
- How to Get the Windows 11 2026 Update (Version 26H2): Windows Update, Installation Assistant and ISO
- Cybersecurity in 2026: Top Threats From the FBI and Verizon Reports and 4 Steps to Stay Safe
- Windows 11 Versions Explained: 24H2, 25H2, 26H1 and 26H2, and When Support Ends
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Last updated: October 22, 2026.
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