Is your computer acting strangely? It might be infected with a virus or malware. Cyber threats are more common than ever, and recognising the warning signs early can save you from data loss, identity theft, and costly repairs. In this article, we’ll cover five common signs of a virus and what you can do to fix the problem.

1. Your Computer is Running Slower Than Usual

One of the most common signs of a virus is a sudden drop in performance. If your computer takes forever to boot up, open programs, or load files, malware could be hogging your system resources.

Why This Happens:

Viruses often run background processes that consume CPU and memory, leaving little room for regular tasks. Some malware, like cryptojacking scripts, hijack your computer's power to mine cryptocurrency for hackers.

What to Do:

• Run a full system scan using your antivirus software.

• Close unnecessary programs and check your Task Manager (Ctrl + Shift + Esc on Windows, Command + Option + Escape on Mac) for suspicious processes.

• Clear temporary files and update your operating system to improve performance.

2. Pop-Ups and Unwanted Ads Are Everywhere

If you’re bombarded with pop-ups, ads, or redirects to strange websites, your computer might have adware—a type of malware designed to generate revenue for attackers.

Why This Happens:

Malicious programs install adware that injects unwanted advertisements, slows down your browser, and may trick you into downloading even more malware.

What to Do:

• Install or update a reputable ad blocker on your browser.

• Run a malware scan using tools like Malwarebytes or Windows Defender.

• Avoid clicking on suspicious ads or links, even if they look legitimate.

• If pop-ups appear when you’re offline, the infection may be deeper, requiring professional removal.

3. Files Are Missing or Corrupted

Malware can delete, encrypt, or corrupt your files. If you notice missing documents, strange file extensions, or files you can’t open, it could be a sign of ransomware or a virus.

Why This Happens:

Ransomware is designed to lock or encrypt your files and demand payment to restore them. Other viruses may delete important system files, leading to crashes and data loss.

What to Do:

• Disconnect your computer from the internet to prevent further damage.

• Use antivirus software to scan and remove the threat.

• Restore files from a backup if available.

• Avoid paying ransomware demands; instead, seek expert assistance to recover your files.

4. Your Browser Acts Strangely

Has your homepage changed without your permission? Are you seeing unfamiliar toolbars or search engines? These are red flags that your browser has been hijacked by malware.

Why This Happens:

Browser hijackers alter settings to drive traffic to malicious sites, collect personal information, or inject more malware into your system.

What to Do:

• Reset your browser settings to default.

• Clear your cache and cookies.

• Uninstall any suspicious browser extensions or add-ons.

• Check for recent software installations—sometimes, unwanted programs bundle with free downloads.

5. Unusual Network Activity

If your internet connection is slower than usual or your data usage has spiked unexpectedly, malware might be using your network to send or receive data.

Why This Happens:

Some malware turns your computer into part of a botnet, using your internet connection to spread spam, perform cyberattacks, or mine cryptocurrency.

What to Do:

• Check your network activity in Task Manager or Resource Monitor.

• Disconnect from the internet and run a full system scan.

• Change your Wi-Fi password to prevent unauthorised access.

• Look for unknown devices connected to your router and remove them.

How to Protect Your Computer from Viruses

Prevention is always better than cure. Here are some tips to keep your computer safe:

• Install Antivirus Software – Use a trusted antivirus program and keep it updated.

  • Unsure which one to choose, check out this guide

• Enable a Firewall – Firewalls act as a barrier between your computer and potential threats.

• Update Your Software – Regularly update your operating system and applications to patch vulnerabilities.

• Avoid Suspicious Links and Downloads – Be cautious when clicking on links or downloading files from unknown sources.

• Back Up Your Data – Regularly back up your files to an external drive or cloud storage.

  • Unsure how, check out this guide

• Use Strong Passwords – Ensure your accounts have unique, strong passwords to prevent unauthorised access.

  • For the most recent advice, check out this guide

• Be Cautious with Emails – Phishing emails often contain attachments or links that install malware on your system.

Conclusion

If you’ve noticed any of these signs, don’t panic—take action immediately. By identifying and addressing the issue early, you can minimise damage and protect your data. Remember, staying vigilant and proactive is the best way to keep your computer safe from viruses and malware.