The Best Ways to Check Your PC for Malware and Ensure Security

If you suspect foul play on your PC, these scans will help you confirm it.

When you think of a computer infected by malware, you might envision flashing pop-ups all over the screen or other obvious signs. However, most modern computer attacks are more subtle, aiming to avoid detection while capturing sensitive information. Signs of potential malware include a sudden slowdown in performance, frequent freezes, or unfamiliar processes running in the background. Whether you suspect an issue or simply want peace of mind, checking your PC for malware is straightforward and can be done using various tools.

Windows 11 includes built-in protection through Microsoft Defender, an antivirus tool that is part of the Windows Security suite. Users can access it via the Start menu, where each icon indicates the system’s status with green checkmarks for normal operations and yellow or red warnings for issues.

The Virus & threat protection section is particularly relevant. Microsoft Defender is enabled by default and performs regular scans for threats, displaying details of the latest findings at the top. Users can check Allowed threats to see flagged items they have approved, which may indicate potential issues. The Protection history tab logs actions taken by Windows Defender.

For a more thorough check, users can select Scan options and choose Full scan > Scan now. This process may take some time, depending on the number of files on the system. The Microsoft Defender Antivirus (offline scan) option restarts the PC into the Windows Recovery Environment, allowing for a deeper scan that can detect hidden threats.

Additionally, users should ensure that the firewall is active for all connection types under the Firewall & network protection section. Understanding how a VPN works can further enhance security.

While Windows Defender provides a solid baseline for security, it is advisable to use at least one additional anti-malware scanner to catch threats that may slip through. One of the most recommended tools is Malwarebytes, which offers a free version with an on-demand scanner. Users can run this scanner when they suspect an issue or as part of regular security checks.

Malwarebytes allows for a Quick Scan to check common threat areas, a Custom Scan for specific locations, or a Deep Scan for a comprehensive examination. If threats are detected, users are provided with options for quarantine or deletion. Malwarebytes also offers a separate tool called AdwCleaner, which targets adware and similar unwanted software.

For those seeking proactive protection, Malwarebytes offers paid subscriptions that include real-time threat protection and additional features, although these are often unnecessary for cautious browsing.

For advanced malware detection, users can enter safe mode before running scans, as this environment operates without a network connection. Microsoft also updates its Malicious Software Removal Tool monthly, designed to detect and remove common malware. To run it manually, users can press Win + R, enter “wrt,” and confirm the UAC prompt.

Other second-opinion tools include the ESET Online Scanner and the Emsisoft Emergency Kit. VirusTotal is also useful for checking files or webpages for infections.

While third-party antivirus solutions can provide additional protection, they are often unnecessary as Windows Defender is designed to be robust. Many third-party tools may bombard users with upgrade prompts, which can be avoided by using free or superior alternatives.

If scans from Windows Defender, Malwarebytes, and other tools return negative results, your PC is likely clean. However, it is crucial to prevent threats from entering your device in the first place. Be cautious of common attack methods, such as suspicious email attachments and unreliable download sites.

It is important to note that antivirus tools cannot protect against all digital threats. For instance, a Malwarebytes scan won’t prevent unauthorized access to your accounts due to weak passwords. Following essential online safety tips can help minimize the risk of malware and other threats.