A slight performance impact can be normal, especially during a full system scan. However, if your computer is constantly slow, there might be an issue. First, make sure you don't have two different antivirus programs installed and running at the same time, as they can conflict and cause major slowdowns. Second, check the software's settings to schedule full scans for times when you aren't using the computer. If the problem persists, the program may be too demanding for your computer's hardware, and you might consider a more lightweight option.

If you're seeing an excessive number of pop-ups that seem to appear on every website, you may have "adware" on your system. Adware is a type of malware specifically designed to bombard you with advertisements. Run a full, thorough scan with your antivirus program. It's also a good idea to check your web browser's extensions or add-ons. Remove any extensions that you don't remember installing or that seem suspicious.

While rare, it's possible for an update to have a bug or create a conflict with other software. The first step is to check for another update; developers often release a fix very quickly once a problem is discovered. You can also search online for the specific update number and the problem you're having to see if others have found a solution. As a last resort, some operating systems allow you to "roll back" or uninstall a recent update, but this should be done with caution as it will also remove any security patches that were included.

For most users, high-quality free antivirus programs—including the security tools built into Windows and macOS—offer solid, essential protection against common threats. They are far better than having no protection at all. Paid antivirus suites typically offer additional features, such as enhanced ransomware protection, a more advanced firewall, parental controls, or a bundled VPN service. Whether these extra features are worth the cost depends on your specific needs.

Yes. While Macs have historically been targeted less frequently than Windows PCs, they are not immune to malware. Threats like adware, spyware, and even ransomware exist for macOS. It's a misconception that Macs are inherently "virus-proof." All Mac users should follow the same security best practices outlined in this guide, including using security software and being cautious online.

"Malware" is the umbrella term for any type of malicious software designed to harm or exploit a computer. A "virus" is a specific type of malware that works by attaching itself to a legitimate program and spreading when that program is run. Other common types of malware include worms (which spread across networks on their own), trojans (which disguise themselves as useful software), spyware (which secretly gathers your information), and ransomware (which locks your files and demands a payment).

Yes, this is possible through what's known as a "drive-by download." This occurs when a malicious website exploits a security vulnerability in your web browser or one of its plugins (like Java or Flash). It can force your computer to download and run malware without you clicking anything. The best defense against this type of attack is to keep your web browser and operating system fully updated at all times, as the updates patch the very vulnerabilities these attacks rely on.