How to Run a Virus Scan on Your Computer? Free Tools

If your computer becomes slower than usual, unexpected pop-ups appear, or your browser redirects you to different pages, these may indicate that your device has malware. In this article, we will explore how to scan your computer for viruses and which free tools you can use.

How to Scan a Computer for Viruses?

On Windows computers, you can start by using the built-in Windows Security app to scan for viruses. The app works with Microsoft Defender Antivirus and provides real-time protection along with different scanning options.

To manually scan your computer through Windows Security, follow these steps:

• Open the Windows Security app from the Start menu.
• Go to Virus & threat protection.
• Click Quick scan.
• For a more comprehensive check, select Scan options.

Since Microsoft Defender comes with Windows, you can perform basic malware scans without installing a separate antivirus program.

How to Run a Quick Scan on Windows?

A quick scan can be used when you want to check your computer in a short amount of time. This type of scan focuses on areas where malware is more likely to be found.

To start a quick scan, go to Windows Security > Virus & threat protection > Quick scan. Once the scan is complete, Windows Security will provide information about any detected threats.

A quick scan can be a practical option when you want to perform a routine check or investigate whether your computer is behaving unusually.

How to Run a Full Scan on Windows?

A full scan provides a more comprehensive examination of files and programs on your computer. According to Microsoft, this process can take longer than a quick scan and may affect computer performance while the scan is running.

To perform a full scan:

• Open the Windows Security app.
• Go to Virus & threat protection.
• Click Scan options.
• Select Full scan.
• Click Scan now.

If you suspect that your computer may contain malware, a more comprehensive scan may be a suitable option.

How to Scan a Specific File for Viruses?

You do not always need to scan your entire computer. You can also use Windows Security to check a specific file or folder that you consider suspicious. Windows allows you to scan individual items with Microsoft Defender directly from File Explorer.

To do this, right-click the file or folder. If you are using Windows 11, open Show more options and then select Scan with Microsoft Defender.

This method can be particularly useful when you want to check a file downloaded from the internet or a source you do not fully trust.

How to Run a Microsoft Defender Offline Scan?

Some types of malware may attempt to hide themselves while Windows is running. In such cases, you can use Microsoft Defender Offline. Since this scan runs before Windows is fully loaded, it can help detect certain threats that may be difficult to identify during normal operation.

Before starting an offline scan, make sure you save any open files because your computer will restart during the process.

The general steps are as follows:

• Open the Windows Security app.
• Go to Virus & threat protection.
• Open Scan options.
• Select Microsoft Defender Offline scan.
• Click Scan now.

Your computer will restart, and the scan will be performed outside of Windows. Once the process is complete, the computer will restart again.

What Are the Free Virus Scanning Tools?

You do not always need paid security software to check your computer. In addition to Microsoft Defender Antivirus, which is integrated into Windows, users can also take advantage of optional scanning tools.

Some of the notable free options include:

• Microsoft Defender Antivirus: Built into Windows 10 and Windows 11, it provides real-time protection and various scanning options.
• Microsoft Defender Offline: Performs a scan without Windows running, helping detect threats that may attempt to hide during normal operation.
• Microsoft Safety Scanner: An on-demand security scanning tool provided by Microsoft. Rather than replacing real-time antivirus software, it can be used for manual scans when needed.

If you are considering using third-party security software, make sure to download it only from a trusted and official source.

When Should You Scan Your Computer for Viruses?

You do not have to scan your computer only when an obvious problem occurs. Using up-to-date security software and keeping your operating system updated are important parts of maintaining device security.

Running a manual scan can be particularly useful in the following situations:

• Your computer suddenly becomes slower than usual.
• Unexpected advertisements or pop-ups appear.
• Your browser redirects you to different websites.
• You notice an unexplained increase in data usage.
• Your computer starts behaving unusually after you download a file from an untrusted source.

These symptoms alone do not prove that your computer contains a virus. However, they may be reasons to scan your device and check its security status.

What Should You Consider When Scanning for Viruses?

Before starting a scan, it is important to make sure that your security software and threat definitions are up to date. Microsoft also recommends keeping Microsoft Defender Antivirus updated and enabling its essential protection features to help detect the latest threats.

You should also avoid unnecessarily disabling security software protection features. In particular, files that are opened or downloaded while real-time protection is disabled may not be scanned immediately.

You can use Windows’ built-in security tools to scan your computer for viruses. A quick scan is suitable for routine checks, while a full scan can be used for more comprehensive examinations. If you encounter suspicious activity, you can also consider running an offline scan or checking specific files individually.