How can you be sure that a virus has been removed from your computer?

There is no way to be 100% sure that a virus has been removed from a computer, but there are a few things you can do to increase the likelihood:

• Run a full system scan with your antivirus software. This will scan your entire computer for known viruses and malware. If any threats are found, the antivirus software will remove them.
• Boot your computer into Safe Mode. Safe Mode is a special diagnostic mode that starts Windows with a limited set of drivers and services. This can help to identify and remove viruses that might be hiding in startup programs or system services.
• Use a malware removal tool. There are a number of free and paid malware removal tools available. These tools can scan your computer for malware that your antivirus software may have missed.
• Restore your computer from a backup. If you have a recent backup of your computer, you can restore it to a point before the virus was installed. This will remove the virus and all of the changes that it made to your computer.

Even if you follow all of these steps, there is still a small chance that the virus may not have been completely removed. However, by following these steps, you can significantly reduce the risk of the virus returning.

Here are some additional tips to prevent viruses from infecting your computer in the first place:

• Keep your software up to date. Software updates often include security patches that can help to protect your computer from known vulnerabilities.
• Use a firewall and antivirus software. A firewall can help to protect your computer from unauthorized access, while antivirus software can help to detect and remove malware.
• Be careful about what links you click on and what attachments you open. Phishing emails are a common way for viruses to spread. Phishing emails often contain malicious links or attachments that can install viruses on your computer.
• Be careful about what apps you download. Only download apps from trusted sources, such as the official app store for your device.

By following these tips, you can help to protect your computer from viruses and other threats.