How To Remove Virus From Computer

Last updated: September 21, 2026 · 5 min read

How Do I Know If My Computer Actually Has a Virus?

You might notice your computer running much slower than usual. Pop-up windows may appear when you’re not clicking anything. Your browser might take you to strange websites you didn’t ask for.

Other warning signs include programs opening or closing by themselves. You may see new toolbars in your web browser that you didn’t install. Your friends might tell you that you sent them strange emails you don’t remember sending.

Sometimes your antivirus software gets turned off by itself and won’t turn back on. This is a big red flag. The virus is trying to protect itself.

Don’t panic if you see these signs. Most viruses can be removed without losing your files or photos. The FBI’s Internet Crime Complaint Center reports that adults over 60 lose more to online fraud than any other age group — over $3.4 billion in 2023. Acting quickly helps protect both your computer and your personal information.

What Should I Do First When I Suspect a Virus?

The very first step is to disconnect from the internet. Unplug your ethernet cable if you use one, or turn off your WiFi. This stops the virus from downloading more bad software or sending your private information to criminals.

Next, write down what’s happening. Are you seeing specific pop-ups? Did something happen right before the problems started, like clicking an email attachment? This information helps if you need to call for help later.

Don’t try to use your email or bank accounts until the virus is gone. The virus might be recording what you type, including passwords. Wait until your computer is clean.

If you have important files that aren’t backed up anywhere else, leave the computer alone and call a professional. Some viruses can lock or delete your files. In those cases, trying to remove it yourself might trigger the virus to do more damage.

How Do I Remove a Virus Using Windows Security?

Windows 10 and 11 come with built-in virus protection called Windows Security. It’s already on your computer and works well for most viruses. Here’s how to use it:

1. Open Windows Security: Click the Start button (the Windows logo in the corner), type “Windows Security” and press Enter. Don’t worry if it takes a moment to open.
2. Click Virus & Threat Protection: You’ll see a shield icon with this label. Click it once.
3. Start a Full Scan: Click “Scan options” under the Quick Scan button. Select “Full scan” and click “Scan now.” This checks every file on your computer and takes 1-2 hours. Let it run even if it seems slow.
4. Review What It Finds: When the scan finishes, Windows Security shows you any threats. Click “Start actions” to remove them. The program does the work for you.
5. Restart Your Computer: After removing threats, restart to make sure everything is cleaned up. Click the Start button, then the power icon, and choose “Restart.”

According to Microsoft’s official guidance, Windows Security updates automatically and protects against most common threats. It’s a good first defense.

Should I Use a Second Virus Scanner for Extra Safety?

Yes, running a second scanner is smart. No single program catches everything. Think of it like getting a second opinion from a doctor.

Malwarebytes is a trusted free tool that works alongside Windows Security. Here’s how to use it:

1. Download Malwarebytes: On a different computer or phone, go to malwarebytes.com. Download the free version and transfer it to your infected computer with a USB drive. This is safer than downloading while the virus is active.
2. Install the Program: Double-click the downloaded file. Click “Yes” if Windows asks permission. Follow the installation steps — just keep clicking “Next” and then “Install.”
3. Run a Scan: Open Malwarebytes and click the big blue “Scan” button. The program checks your computer for about 30 minutes. You can use your computer for other things while it scans.
4. Remove Threats: When finished, Malwarebytes shows what it found. Click “Quarantine” to isolate the bad files. Then restart when prompted.

The free version of Malwarebytes works perfectly for removing existing viruses. You don’t need to pay for the premium version unless you want ongoing automatic protection.

What Is Safe Mode and When Should I Use It?

Safe Mode starts Windows with only the basic programs needed to run. Viruses usually can’t start in Safe Mode, which makes them easier to remove.

Use Safe Mode if your computer is so slow you can barely click anything, or if it keeps restarting by itself. Here’s how to get there:

1. Access the Settings: If your computer is working enough, click Start, then the gear icon for Settings. Go to “Update & Security” and then “Recovery.”
2. Start in Safe Mode: Under “Advanced startup,” click “Restart now.” Your computer restarts to a blue screen with options. Click “Troubleshoot,” then “Advanced options,” then “Startup Settings,” then “Restart.” When the computer restarts again, press the number 4 key for Safe Mode.
3. Run Your Scans: Once in Safe Mode, run Windows Security and Malwarebytes just like normal. The scans work faster because the virus isn’t fighting back.
4. Restart Normally: After scanning and removing threats, restart your computer normally. It should start up clean.

Safe Mode looks different — the screen shows lower resolution and says “Safe Mode” in the corners. This is normal. Don’t worry, you’re not breaking anything.

How Can I Protect My Computer After Removing the Virus?

Once your computer is clean, you want to keep it that way. Make sure Windows Security is turned on and set to update automatically. It should be, but double-check in the Windows Security program.

Change your important passwords, especially for email and banking. Do this from your now-clean computer or from a different device. The virus may have recorded your old passwords.

Be more careful with email attachments. Don’t open attachments unless you’re expecting them, even from people you know. Their email might have been hacked. When in doubt, call the person and ask if they really sent it.

Keep Windows itself updated. Click Start, type “Windows Update” and make sure it says your computer is up to date. These updates fix security holes that viruses use to get in.

For more detailed information about staying safe online, the FTC offers helpful guidance on recognizing scams before they infect your computer.

When Should You Ask for Help Instead of Fixing It Yourself?

Some virus situations need a professional. Don’t feel bad about asking for help — these situations can be tricky even for tech-savvy people.

Call for help if you see a message saying your files are encrypted or locked, and demanding payment. This is called ransomware. Don’t pay the ransom. A professional may be able to recover your files.

If you’ve tried scanning multiple times but the same problems keep coming back, the virus is hiding somewhere your scanners can’t reach. Our technicians have specialized tools for stubborn infections.

When you can’t even start your computer, or it immediately shuts down when you try to run scans, professional help is needed. The virus has taken over too much control.

If the virus got in through clicking a link about a package delivery, bank problem, or government notice, you might be dealing with a scam that also stole personal information. Our virus & malware removal service can clean your computer and check what information may have been compromised.