Computer Virus: Types, Symptoms, Protection & Removal

Computer Virus

On this page you will learn everything you need to know about the types, symptoms, protection, prevention, detection and removal of computer viruses.

Everything explained in a easy way.

What is a Computer Virus?

A computer virus is a type of malware (malicious software or code) that is designed to spread from computer to computer and perform harmful activities such as corrupting and disrupting systems or destroying data.[1]

Computer viruses can also copy (duplicate) themselves.

Computer Virus: Types

A list with well know computer virus types:

Computer Virus: Symptoms (Signs)

Here are some symptoms of a computer virus infection:

Computer Virus: Prevention

trick to install a computer virus on your computer

Computer Virus: Protection

The BEST protection against computer viruses is YOU.


You can have the best protection there is, but even the best antivirus software can fail to detect new malware.[8]

Malware threats grow so fast, that antivirus programs take too long to catch up with malware (even the best free or paid ones).[9]

Therefore, the best protection is yourself.

If you do any of the following:

Then there's a good chance that your PC will get infected one day.


You should always install a antivirus program on your PC – even when antivirus software can't protect you against all viruses.

It's better to have some protection than no protection at all.

You should only install one (1) antivirus program on your computer.

If you're looking for a good antivirus solution, then Bitdefender and Kaspersky are good options.

Bitdefender and Kaspersky always get good results in antivirus tests (AV-tests) and also won many awards.


You can also use a free computer virus protection, like the free versions of Bitdefender and Kaspersky.

Additional Software

You can also use additional software and services software like second opinion online scanners and anti-exploit software.

The following programs are good:

The good thing about online second opinion scanners is that you have the chance to scan your system with multiple antivirus programs.

Some antivirus programs may catch viruses that other antivirus programs miss, so that's why it's a good idea to scan with multiple antivirus solutions.

Computer Virus: Detection & Removal

I will show you how to detect and how to get rid of a computer virus for free.

Step 1: Delete Temporary Files

Deleting your temporary files can speed up the scanning process and also free up disk space.

You don't need to install any extra software, because Windows has a built-in tool called "Disk Cleanup".

1. Open Windows Disk Cleanup.

Three ways to open this tool:

2. Select the Windows drive (when asked for and if not already selected).

(C:) is the default installation location for Windows.

3. Click on "OK".

The tool will now calculate how much disk space you will be able to free on your system drive.

4. Select the type of files you want to delete. I always select everything.

5. Click on "OK".

6. Click on "Delete Files".

This may take a while. The time it takes depends on how many files need to be deleted. When it's finished the tool will close by itself.

Step 2: Full System Scan with Your Antivirus Software


Your antivirus program may missed the malware that has infected your PC the first time.


Antivirus companies update their virus definitions hourly, daily or weekly, so it's possible that the malware that has infected your PC has been added in the last update.

First update your antivirus software and then run a full system scan with the program.

Step 3: Malwarebytes

You can download Malwarebytes here.

When you install Malwarebytes it will automatically enable a two week trial version of the premium version, but if you don't want the two week trial, then you can easily disable it in the settings.

1. Open Malwarebytes.

2. Click on "Settings" (located at the left side).

3. Click on "Protection" (located at the top).

4. Go to "Scan Options".

5. Turn on "Scan for rootkits".

enable scan for rootkits in malwarebytes

Note: You will only have to change this setting once.

6. Go back to the Malwarebytes "Dashboard".

7. Click on "Scan Now".

Malwarebytes will now scan for malware.

This may take a while (about 30 till 45 minutes).

When the scan is completed it will show you the results of the scan.

8. If a computer virus or other malware is detected, then click on "Remove Selected" to remove the infections.

Malwarebytes may ask you to restart your PC.

Step 4: Kaspersky Virus Removal Tool

Kaspersky Virus Removal Tool is another tool for removing computer viruses and other malware.

You can download Kaspersky Virus Removal Tool here.

1. Open Kaspersky Virus Removal Tool.

2. Accept the "End User License Agreement".

3. Click on "Change parameters".

4. Select (check) "System drive" and click on "OK".

5. Click on "Start scan".

Kaspersky Virus Removal Tool will now scan for malware.

This may take a while (about 30 till 45 minutes).

When the scan is completed it will show you the results of the scan.

6. If a computer virus or other malware is detected, then click on "Continue" to remove the infections.

Step 5: ESET Online Scanner

You can download ESET Online Scanner here. Click on "SCAN NOW" to download this tool.

1. Double-click on "esetonlinescanner.exe" to open the scanner.

2. If you are using an older version (maybe you used it before), then check (select) "Download latest version of ESET Online Scanner". But if you just downloaded it, then you don't need to select this option.

3. Click on "Accept".

4. Select one of the following options:

5. Click on "Scan".

ESET Online Scanner will now scan for malware.

This may take a while (about 30 till 45 minutes).

When the scan is completed it will show you the results of the scan.

6. Now you will have two options:

7. Now you will have the following (optional) options:

8. Click on "Finish".

That's it. Hopefully your PC is clean now and you know enough about computer viruses.

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