How a Computer Gets a Virus
There are several ways a computer can get infected by a virus and most of them involve downloading – either intentionally or unintentionally – infected files. Pirated music or movies, photos, free games and toolbars are common culprits, as are phishing/spammy emails with attachments. Viruses can also be downloaded by visiting malicious websites or clicking links or ads to an unknown/unsecure website. Even connecting to an infected external drive (like a USB) can introduce malicious software into your system.
How to Spot a Computer Virus
If you notice any of the following issues with your computer, it may be infected with a virus:
Slow computer performance (taking a long time to start up or open programs)
Problems shutting down or restarting
Missing files
Frequent system crashes and/or error messages
Unexpected pop-up windows
New applications (toolbars, etc.) that appear without you downloading them
Overworked hard drive (the fan makes sounds and seems to be whirring and working hard when you aren’t doing much)
Emails that send autonomously from your accounts
Browser lag or redirects
Malfunctioning antivirus programs or firewalls
Stay protected with Windows Security
Windows 10 and 11 include Windows Security, which provides the latest antivirus protection. Your device will be actively protected from the moment you start Windows. Windows Security continually scans for malware (malicious software), viruses, and security threats. In addition to this real-time protection, updates are downloaded automatically to help keep your device safe and protect it from threats.
Status icons indicate your level of safety:
Green means there aren’t any recommended actions right now.
Yellow means there is a safety recommendation for you.
Red is a warning that something needs your immediate attention.
Run a malware scan manually
When you're concerned about risks to a specific file or folder, you can right-click the file or folder in File Explorer, then select Scan with Microsoft Defender.
If you suspect there's malware or a virus on your device, you should immediately run a quick scan. This is much faster than running a full scan on all your files and folders.
Run a quick scan in Windows Security
Run an advanced scan in Windows Security
Select Start > Settings > Update & Security > Windows Security and then Virus & threat protection.
Under Current threats, select Scan options (or in early versions of Windows 10, under Threat history, select Run a new advanced scan).
Select one of the scan options:
Full scan (check files and programs currently running on your device)
Custom scan (scan specific files or folders)
Microsoft Defender Offline scan (run this scan if your device has been, or could potentially be, infected by a virus or malware). Learn more about Microsoft Defender Offline
4. Select Scan now.
Schedule your own scan
Even though Windows Security is regularly scanning your device to keep it safe, you can also set when and how often the scans occur.
Schedule a scan
Select the Start button, type schedule tasks in the Search box, and in the list of results, select Task Scheduler.
In the left pane, select the arrow (>) next to Task Scheduler Library to expand it, do the same with Microsoft > Windows, and then scroll down and select the Windows Defender folder.
In the top-center pane, select Windows Defender Scheduled Scan. (Point to the choices to see the full names.)
In the Actions pane on the right, scroll down and then select Properties.
In the window that opens, select the Triggers tab, and then select New.
Set your preferred time and frequency, and then select OK.
Review the schedule and select OK.
Protecting Your Computer Against a Virus
While hackers are continuously creating smarter and more advanced viruses, there are several ways to protect your device and files.
The best way to deal with a virus is to prevent it in the first place by using antivirus protection and antispyware software. It’s important to keep these applications up to date, as well as regularly updating your operating system and making sure that your browser’s security settings are current. Regularly back up your files (to the cloud or safe external hard drive) in case they become corrupted, ransomed or are deleted. Use a security tool to evaluate your device and find out how vulnerable it might be.
When you’re surfing the internet, don’t click questionable links or pop-ups. Your browser may warn you about suspicious websites, or you might see a red unlocked lock to the left of the URL at the top of the webpage if it is unsecured. This doesn’t always mean a website is dangerous, but you may want to think twice about browsing or entering your information.
Another good rule of thumb is to never open an email or attachment unless you know and trust the sender. Oftentimes, hackers will use a friend’s name as the sender or use “Re:” in the subject line to trick you, so double check the actual email address to see if you recognize it. If you open the email and still aren’t sure, even if it’s from a trusted source, it’s still best to delete.
Be very careful when downloading software. Only download programs, movies and music from legitimate websites or services.
Many people connect using public Wi-Fi in cafes, restaurants or stores, but these unsecured networks can leave your phone, tablet or computer susceptible to viruses. Instead, consider using a personal hotspot to connect to the internet. If public Wi-Fi is your only option, use a VPN to better protect your device and data.
Finally, educate yourself about the types of threats out there and teach others to do the same. For instance, around 95 percent of teens use the internet, but 18 percent say they haven’t been educated about “good online behavior.” By taking the time to talk with your family about safe online habits, you can drastically lower the risk of devices being compromised.
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