A computer virus rarely announces itself politely. Instead, it shows up as a series of small, frustrating symptoms that are easy to brush off — until your files, passwords, or banking details are at risk. If your PC has been acting strangely, here are the seven most common warning signs your computer has a virus, and what to do about it.

1. Your Computer Is Suddenly Slow

A sudden, dramatic slowdown is one of the most common signs of malware. Viruses run hidden processes in the background that eat up your CPU and memory. If your once-fast PC now crawls, it’s worth investigating — though sometimes the cause is simply an aging drive that needs a tune-up.

2. Constant Pop-Ups and Ads

Pop-ups appearing on your desktop or flooding your browser — especially ones warning you about “infections” or prizes — are a classic adware symptom. Never click them. They often lead to more malware.

3. Your Browser Has Changed on Its Own

A new homepage you didn’t set, a different search engine, or unfamiliar toolbars and extensions are signs a browser hijacker has taken hold.

4. Programs Crash or Won’t Open

If applications freeze, crash, or refuse to launch — or your computer restarts on its own — malware may be interfering with your system files.

5. You’re Locked Out or Files Are Encrypted

Being locked out of your files with a demand for payment is ransomware — one of the most dangerous infections. Don’t pay. Disconnect from the internet and get professional help immediately. Your files may be recoverable through data recovery.

6. Your Battery Drains or Fan Runs Constantly

Malware working in the background makes your processor run hard, draining the battery faster and keeping the fan loud even when you’re not doing much.

7. Friends Receive Strange Messages From You

If contacts report odd emails or social media messages they say came from you, malware may be using your accounts to spread itself.

What To Do If You Suspect a Virus

Disconnect from the internet to stop the spread, avoid logging into banking or sensitive accounts, and don’t click any suspicious pop-ups. Then get the machine properly cleaned. A professional removal does more than delete one file — it finds and removes hidden malware, checks that nothing was left behind, and protects your data.

Professional Virus Removal in Calgary

At CompuTech Fix, we safely remove viruses, spyware, and ransomware while protecting your files — and we’ll set you up to stay protected. Learn more about our virus removal service in Calgary, or call (403) 333-3114 for same-day help. We serve Calgary, Airdrie, Cochrane, and Okotoks.