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To secure a Windows 11 PC, review the Windows Security app, keep its built-in protections enabled, and confirm that device-specific safeguards such as Secure Boot and drive encryption are configured. These layers reduce risk; none guarantees that every threat will be blocked. Some settings depend on hardware, firmware, Windows setup, or work or school policy.
Start with the Windows Security dashboard
Open Start, search for Windows Security, and review the overview. Its green, yellow, and red status icons show whether recommended actions or attention are indicated. Select an area to inspect it: Virus & threat protection, Account protection, Firewall & network protection, App & browser control, Device security, or Protection history. On a work or school PC, an administrator may manage settings or prevent changes. Microsoft’s Windows Security guide explains the dashboard and its areas.
Keep antivirus protection on and scan when needed
Check Microsoft Defender Antivirus
Microsoft Defender Antivirus is integrated with Windows Security. Check Virus & threat protection to review its status and available actions. Keep real-time protection enabled unless you have a specific, informed reason to change it. Microsoft warns that files opened or downloaded are not scanned while real-time protection is off; it also says the feature turns back on automatically after a period. That automatic behavior is not a reason to leave it off.
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Run a scan
- For a manual scan, open Windows Security > Virus & threat protection > Quick scan.
- To scan an individual file or folder, right-click it in File Explorer and choose Scan with Microsoft Defender. In Windows 11, the command may be under Show more options.
For details on these controls, see Microsoft’s instructions for staying protected with Windows Security.
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Use the firewall and select the right network profile
Open Windows Security > Firewall & network protection. Review the active network and firewall status. Windows distinguishes domain, private, and public profiles; use the profile that reflects how much you trust the network and the other devices on it.
| Profile | When it fits | Practical implication |
|---|---|---|
| Private | A trusted network, such as your home network | Use when you trust the network and may want device discovery or connections with other devices. |
| Public | An untrusted network, such as a coffee-shop network | Use when you do not trust other devices on the network and want to limit discoverability and connections. |
| Domain | A network managed by an organization | Its configuration may be controlled by your organization. |
If a needed app is blocked, allow that app through the firewall rather than turning the firewall off. Organization policy may prevent you from changing the settings. See Microsoft’s firewall and network profile guidance.
Review protection for apps, files, and websites
Open Windows Security > App & browser control. Review Microsoft Defender SmartScreen and the related controls for potentially unwanted apps and phishing protection. SmartScreen can check websites and downloaded files and warn about or block known risks. It is one protective layer, not a guarantee that harmful content will always be detected.
Microsoft describes Smart App Control as allowing apps based on publisher and reputation signals. Its availability and behavior depend on the current Windows version and the PC’s setup, so check what appears in your own App & browser control page rather than assuming the feature is active. Microsoft’s overview of smart security features describes these protections.
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Choose a sign-in method and review automatic locking
In Windows Security > Account protection, follow the links to Windows Hello settings and Dynamic Lock. Windows Hello provides sign-in options; which methods are available depends in part on the device’s hardware. Dynamic Lock can lock the PC when you move away. Check the available options and set up only the sign-in methods you intend to use. See Microsoft’s Account protection overview.
Check TPM, Core isolation, and Secure Boot
Open Windows Security > Device security to inspect Core isolation, Security processor (TPM), Secure Boot status, and the link to data encryption. What is displayed depends on the PC’s hardware and configuration.
Security processor (TPM)
A Trusted Platform Module (TPM) is a security processor that helps protect cryptographic keys and supports Windows security features. Windows 11 requires TPM 2.0. If the TPM section is missing, the PC may lack a TPM or it may be disabled in UEFI firmware. Before changing firmware settings, follow the PC manufacturer’s instructions. Learn more in Microsoft’s TPM guide.
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Microsoft describes Core isolation as running core processes in a virtualized environment. Review its status in Device security; the available options can depend on the PC’s hardware and configuration. For an explanation of the Device security page, see Microsoft’s Device security guide.
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Secure Boot
Windows 11’s system requirements call for UEFI firmware with Secure Boot capability. Secure Boot verifies startup software against trusted signatures to help prevent boot-level malware. The PC must support it, and its status is visible in Device security. Microsoft’s Windows 11 and Secure Boot guidance explains the feature and its firmware context; Windows 11 system requirements list the platform requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check drive encryption and safeguard its recovery key
BitLocker encrypts a drive so someone who accesses it offline cannot read its contents. Device Encryption is the simpler option and is usually enabled automatically on eligible devices. BitLocker Drive Encryption is the manual option for advanced scenarios. Availability and setup depend on the device and Windows configuration; check the data encryption link in Device security or the encryption settings available on your PC.
A recovery key matters if Windows needs it to unlock an encrypted drive. Back it up using Microsoft’s guidance and keep a copy somewhere you can access if the PC cannot start normally. A USB flash drive is one optional offline location, not a requirement. Microsoft says support cannot replace a lost recovery key or generate a new one to unlock the drive. Read Microsoft’s BitLocker overview for encryption and recovery details.
Install updates and check Secure Boot certificate notices
Use Windows Update to receive Windows security updates. Microsoft says that updated Secure Boot certificates are rolling out and that most devices receive them through Windows Update; some devices may be prevented from updating. That does not establish whether a particular PC has received the certificates. If Windows Security reports a Secure Boot certificate issue, consult Microsoft’s troubleshooting guidance for devices prevented from updating Secure Boot certificates and the device manufacturer’s instructions.
Know what is included with Windows
Windows Security provides the built-in protections covered here, including antivirus, firewall, app and browser controls, and access to device-security status. Microsoft also describes identity theft monitoring as an added Microsoft 365 Personal or Family subscriber feature, separate from protections included with Windows. Feature availability can change; consult Microsoft’s Windows Security feature information for current details.
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