Is your computer acting strange? You might have a virus. Malware infections can be subtle at first, but they almost always leave tell-tale signs if you know what to look for. Here are seven warning signs your computer may be infected — and what to do about it.
1. Your Computer Is Running Unusually Slow
A sudden slowdown is one of the most common signs of a virus. Malware often runs silently in the background, consuming CPU and RAM. If your PC or Mac suddenly takes forever to boot or apps lag when they never did before, a scan is in order.
2. You’re Getting Unexpected Pop-Ups
Pop-up ads appearing even when your browser is closed — or especially ones that warn about “viruses detected” and urge you to call a number — are a classic sign of adware or scareware. Never call those numbers. Legitimate companies don’t operate this way.
3. Programs Open or Close on Their Own
If applications launch or quit without any input from you, something else is controlling your computer. This can be a sign of a remote access trojan (RAT) or other malware that gives attackers control of your system.
4. Your Browser Homepage Changed Without Your Permission
Hijacked browsers are a clear sign of infection. If your homepage is suddenly different, you’re being redirected to strange sites, or new toolbars appeared that you didn’t install, your browser (and likely your system) is compromised.
5. You’re Getting Warnings That Your Security Software Is Disabled
Smart malware disables your defenses first. If your antivirus says it’s turned off but you didn’t turn it off, that’s a serious red flag. Some viruses specifically target security software to prevent removal.
6. Unusual Network Activity
High internet usage when you’re not actively browsing — especially at night — can mean your computer is part of a botnet, sending spam, or uploading your data to criminals. Check your router logs or use a network monitor to spot unusual traffic.
7. Friends Are Receiving Suspicious Emails or Messages From You
If contacts tell you they’re getting strange emails or social media messages from your accounts, your credentials may have been stolen. Change your passwords immediately from a clean device, and scan your computer for keyloggers.
What to Do If You Suspect a Virus
First, don’t panic — and don’t pay any ransom or call any “tech support” numbers that appeared in a pop-up. Disconnect from the internet if you’re concerned about data theft. Run a reputable antivirus scan (Malwarebytes Free is excellent for this). Back up important files to an external drive if the computer is still functional.
If the infection is severe — ransomware, rootkits, or anything that survives rebooting — the safest fix is a professional wipe and reinstall. Naples Computers Inc. specializes in virus and malware removal in Naples, FL. We can diagnose and clean your system the same day in most cases.
Call us at 239-513-1960 or stop by our shop at 2308 Immokalee Rd, Naples, FL 34110. Most virus removals are completed within 24 hours.