How can I know if my computer has a virus?

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Other answer:

Sudip Chatterjee:
Symptoms of Virus or Malware Infection:-

The typical symptoms that your computer may have been compromised are:

1. Change in your browsers home page or default search
2. Your web browser hangs or becomes sluggish
3. Your computer starts behaving sluggishly or hangs often
4. You are unable to open security-related sites or domains.
5. You get re-directed to web pages you did not intend to visit
6. Unexpected toolbars in your browser
7. Security software or Firewall disabled
8. Your security software throws up warnings or its icon turns red or something.
9. Pop-ups while browsing, unknown or excessive
10. Balloon Notifications from your system tray
11. Excessive CPU or Memory utilization
12. Internet or data transfer activity – Modem appears to be working overtime
13. You start seeing unexpected Windows error messages
14. Some programs start automatically
15. Some important Windows functions or features disabled. Eg, Task Manager, Registry Editor, Control Panel, Command Prompt, etc.
16. New unknown unwanted software installed, etc.
17. You see new icons on your desktop suddenly.

Scan using a multi scanner called HerdProtect it will scan your entire device using almost every security program that exists on the internet at the end it will give you a full report of everything that is in your computer and if it finds any kind of malicious stuff at all it will tell you exactly which software on the internet has the power to eradicate or you just let HerdProtect do it for you this is much more effective than simply installing all kinds of different security apps one after the other which will by themselves mess up your computer by having too much stuff. This is the new way of scanning computers compared to how we used to
It’s not always easy to tell if your computer has been compromised. More than ever before, the authors of viruses, worms, Trojans and spyware are going to great lengths to hide their code and conceal what their programs are doing on an infected computer. That’s why it’s essential to follow the advice given in this guide: in particular, install Internet security software, make sure you apply security patches to your operating system and applications and backup your data regularly.

It’s very difficult to provide a list of characteristic symptoms of a compromised computer because the same symptoms can also be caused by hardware and/or software problems. Here are just a few examples:

– Your computer behaves strangely, i.e. in a way that you haven’t seen before.

– You see unexpected messages or images.

– You hear unexpected sounds, played at random.

– Programs start unexpectedly.

– Your personal firewall tells you that an application has tried to connect to the Internet (and it’s not a program that you ran).

– Your friends tell you that they have received e-mail messages from your address and you haven’t sent them anything.

– Your computer ‘freezes’ frequently, or programs start running slowly.

– You get lots of system error messages.

– The operating system will not load when you start your computer.

– You notice that files or folders have been deleted or changed.

– You notice hard disk access (shown by one of the small flashing lights) when you’re not aware of any programs running.

– Your web browser behaves erratically, e.g. you can’t close a browser window.

Use a virus checker to scan your computer. There are online versions that are free to use.
Ask yourself two simple questions…

Is my computer running the Windows operating system?

Is my computer connected to the Internet?

If the answer to both questions is yes then your computer will have a virus.

You can never know. that is why you never use a computer without a fully updated active anti-virus.
if your computer is working fine then your should not worried about it. also you can scan with panda antivirus (updated version) to know if there is any virus on your computer
Amirhossein Rafie:
scan it with an antivirus install avira if you want a free one and bitdefender total security(it has trial version for 30 days too)(i recommend it) for a paid one its your choice scan the computer if it didnt install none of the two download eset sysrescue and burn it to a disc and boot from it and scan your computer