Detecting Computer Viruses: A Guide for Users

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Ngày cập nhật gần nhất: 15/4/2026

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Detecting a Virus on Your Computer

Viruses stand as one of the most significant threats to computer users. These malicious programs are designed to steal or destroy personal data. If you're wondering how to detect if your computer is infected with a virus, refer to the article below by Mytour.

Viruses are harmful programs crafted to steal data or wreak havoc on targeted computer systems, serving the objectives of attackers.

The proliferation of these malicious codes is increasing, with a growing number of users falling victim due to inadequate security measures. To identify a computer infected with a virus, two crucial issues must be addressed: recognizing signs of infection and deploying real-time protection through antivirus software.

Computer Viruses: Diverse Types and Detection Methods

Detecting a Virus on Your Computer

Here are some signs to identify a computer infected with a virus:

Method 1: Monitor Computer Performance

- Check Hard Drive Activity: If your hard drive light is flickering without any running programs, or if you hear constant hard drive activity, there's a high chance a virus is operating in the background. Also, watch out for unusual CD-ROM open/close behavior.

- Computer Boot Time: If your computer takes longer to start than usual, it's likely due to a virus slowing down the startup process. Or if you can't log in to Windows, even with correct login information, it's likely due to a virus.

- Monitor Modem Lights: If no programs are running in the background but the modem lights are constantly blinking, this could be a sign of a virus transmitting data over the network.

Method 2: Monitor System Programs, Files, and Browsers

- Continuous App Crashes: If regular applications and programs frequently experience issues, freeze, or take an unusually long time to load or execute, these are signs of a computer infected with a virus.

How to know if your computer is infected with a virus?

- Constant Popup Windows: Once a victim's computer is infected with a virus, the screen will continuously display popup advertising windows or error messages, even when no background programs are running. Additionally, the virus may alter the computer's wallpaper without the user's permission. If you notice a change in your computer's wallpaper that you didn't authorize, be cautious as your computer may be infected with a virus.

Causes of computer virus infections?

- Firewall Access Requests: If you continuously receive notifications from any program requesting firewall access, it's a sign that the program may be infected with a virus. This notification occurs because the program is attempting to transmit data through the router.

- Files, Data: After infiltration, viruses often delete or make changes to files, especially Exe files. Computers infected with exe viruses are at high risk when storing software installation files for an extended period in victim computers' directories. Suddenly, one day, your valuable files and documents may vanish. Be cautious of viruses.

- Web Browsers: Web browsers opening new homepages or preventing the closure of tabs, continuous popup windows appearing on the browser window; these signs indicate that the browser may be under attack by viruses or spyware.

Method 3: Run Anti-Virus Software and Programs

- Run Effective Anti-Virus Programs: Install efficient antivirus programs on your computer, scan to check for virus infections, and remove them if found.

On the Internet, there are numerous antivirus programs, making the choice of an effective one a challenge. Moreover, malicious programs can disguise themselves as legitimate antivirus software to deceive users into downloading and installing them.

If you're unsure which antivirus program is effective, readers can refer to the article on the top antivirus software for computers and laptops on Mytour to learn more and make an informed choice.

In case your computer is infected with a virus and you can't access the internet to download antivirus software, you can download these programs on another computer and transfer the installation files to a USB drive.

- Boot into Safe Mode: Antivirus programs function more effectively in Safe Mode. To access Safe Mode, the simplest method is to restart your computer and during startup, press the F8 key repeatedly until the Advanced Boot menu appears. Here, choose Safe Mode from the menu.

Besides, there are many signs indicating that your computer or laptop may be infected with a virus, such as:

Via Email

- Friends or colleagues receiving emails from your account that you didn't send
- Inbox filled with numerous messages with no sender addresses

In addition, readers can explore more on how to access Safe Mode on Windows 7/8/10 on Mytour for alternative methods to enter Safe Mode.

This article on Mytour has just answered your question about detecting a virus-infected computer. If you have any further inquiries or questions, feel free to share your thoughts in the comments section below the article.

Frequently Asked Questions

What are the common signs that indicate my computer may be infected with a virus?

Common signs of a virus infection include unusual hard drive activity, longer boot times, frequent application crashes, constant pop-up windows, and changes to your computer wallpaper without authorization. Additionally, unexpected requests for firewall access and new homepages in web browsers can also signal a potential virus.

How can I effectively detect a virus on my computer?

To detect a virus, monitor your computer's performance, check for unusual hard drive activity, and watch for continuous app crashes. It's crucial to run effective antivirus programs, as they can identify and remove viruses from your system.

Is using antivirus software enough to protect my computer from viruses?

No, while antivirus software is essential for protection, it is not always enough. Regularly updating the software, avoiding suspicious downloads, and maintaining good online practices are necessary to enhance your computer's security against viruses.

How do I boot my computer into Safe Mode for virus scanning?

To boot into Safe Mode, restart your computer and repeatedly press the F8 key during startup. From the Advanced Boot menu, select Safe Mode. This mode allows antivirus programs to function more effectively and helps in detecting and removing viruses.

Can I transfer antivirus software installation files from another computer?

Yes, if your computer is infected and cannot access the internet, you can download antivirus software on another computer. Transfer the installation files to a USB drive and then install it on your infected computer.

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