Computer viruses are no longer just a problem for outdated PCs — even modern laptops, gaming systems, and business computers are vulnerable.
In 2025, as hackers grow more advanced, the number of virus infections across the UK continues to rise.
At Hire IT Expert, we’ve helped thousands of customers remove malware, spyware, and ransomware from their devices through our trusted computer virus removal service.
But the best defence against viruses is understanding how they infect your system in the first place.
In this detailed guide, we’ll cover the top 10 causes of computer viruses, how they spread, and simple steps you can take to protect your device.
Downloading Files from Unsafe Websites
One of the most common reasons computers get infected is downloading software, movies, or games from suspicious sites.
Many of these downloads include hidden malware or trojans designed to steal data or damage your system.
Prevention Tips:
- Only download files from official websites or trusted app stores.
- Avoid clicking on “Free Download” or “Cracked Software” links.
- Use antivirus software to scan all downloaded files.
💡 If you suspect a virus infection after downloading something, get help from our computer virus removal service to safely clean your system.
Email Attachments and Phishing Scams
Email remains a top method hackers use to spread viruses. Malicious attachments and fake links are disguised as invoices, job offers, or delivery updates.
Prevention Tips:
- Never open attachments from unknown senders.
- Verify the sender’s email address before clicking links.
- Use spam filters and security plugins for added safety.
⚠️ Even advanced users fall for phishing scams. Our laptop virus removal experts can help remove any malware left by email-based attacks.
Visiting Infected or Fake Websites
Hackers create clone websites that look like real ones — especially for banks or online stores. These sites inject malicious scripts into your browser or system when visited.
Prevention Tips:
- Always check if a website starts with https:// (secure).
- Use browser security extensions that warn you of fake sites.
- Keep your browser and plugins up to date.
Using Infected USB Drives or External Devices
Viruses can easily spread through infected USB drives, cameras, or hard disks. Once plugged in, they automatically copy themselves into your system folders.
Prevention Tips:
- Scan all external drives with antivirus before use.
- Avoid using untrusted USB drives.
- Disable “auto-run” for removable devices.
💻 If you use shared drives at work, consider a remote virus removal in the UK plan to keep all systems monitored and secure.
Outdated Software and Missing Security Updates
Neglecting updates can leave your system vulnerable to known exploits. Hackers target outdated browsers, operating systems, and software tools.
Prevention Tips:
- Enable automatic updates for Windows or macOS.
- Regularly update browsers, plugins, and antivirus programs.
- Avoid using unsupported software versions.
Clicking Malicious Ads (Malvertising)
Many online ads are fake and designed to trigger malicious downloads when clicked. These appear on shady streaming, gaming, or adult websites.
Prevention Tips:
- Use an ad-blocker extension.
- Never click on “system alerts” or “update pop-ups.”
- Stay away from pirated or illegal streaming sites.
🧰 If you’ve been hit by fake pop-ups or browser hijackers, our computer repair service can clean and optimise your system quickly.
Connecting to Public Wi-Fi Networks
Public Wi-Fi in cafés, hotels, or airports can expose your data to hackers using man-in-the-middle attacks. This allows them to inject viruses or steal passwords.
Prevention Tips:
- Avoid accessing sensitive accounts on public Wi-Fi.
- Use a VPN for encrypted browsing.
- Turn off “auto-connect” to open networks.
Installing Unverified Browser Extensions
Browser add-ons can improve your experience — but many contain hidden spyware. They track browsing activity and can install harmful code without permission.
Prevention Tips:
- Only install extensions from Chrome Web Store or Safari Extensions Gallery.
- Review permissions before installing.
- Delete unused or suspicious extensions.
Ignoring Antivirus Warnings
Ignoring antivirus alerts or temporarily disabling protection is risky. Many infections occur when users dismiss warnings to “allow” an unsafe file.
Prevention Tips:
- Always trust your antivirus alerts.
- Schedule automatic system scans weekly.
- If antivirus cannot remove the threat, call professional support.
💬 Our laptop virus removal experts can assist remotely if your antivirus software fails to clean an infection.
Lack of Proper System Maintenance
Systems that are rarely cleaned or optimised accumulate junk files and vulnerable software. This makes it easier for malware to hide or execute unnoticed.
Prevention Tips:
- Clean your PC or Mac monthly using professional tools.
- Use antimalware and adware cleaners regularly.
- Consider periodic servicing from a computer repair service for deep optimisation.
How to Protect Yourself from Future Viruses
Once your system is clean, prevention becomes your best weapon. Follow these protection essentials to stay safe long-term:
✅ Install a reliable antivirus and keep it updated.
✅ Enable real-time web and email protection.
✅ Avoid suspicious websites and downloads.
✅ Backup your files regularly.
✅ Schedule monthly deep scans.
Learn more about our remote virus removal in the UK and keep your device secure 24/7 from anywhere in the country.
Why Choose Hire IT Expert?
Hire IT Expert is one of the UK’s most trusted names in IT support and virus removal. We offer both on-site and remote solutions, covering all major cities including: London, Bromley, Croydon, Manchester, Birmingham, Leeds, and Liverpool.
Our services include:
- Computer and laptop virus removal
- Spyware and malware removal
- Windows and macOS protection setup
- Computer repair and performance optimisation
📞 Call 08085 01 5740 or visit for same-day virus removal service across the UK.
Final Thoughts
Understanding the causes of computer viruses is the first step toward total protection. Whether you’re at home or running a business, simple precautions can prevent major data loss or downtime.
If your device is already infected, don’t panic — contact Hire IT Expert, the UK’s trusted name for remote virus removal and computer repair service. We’ll clean, secure, and optimise your system — so you can work and browse with total peace of mind.
Frequently Asked Questions About Virus Removal
Can you remove spyware and ransomware too?
Yes, our certified experts remove spyware, ransomware, trojans, and other advanced threats — and install updated protection to prevent future infections.
Do you cover MacBook and Apple devices?
Absolutely. We specialise in MacBook virus and malware removal, offering both on-site and remote support throughout the UK.
What’s the cost of virus removal in London?
The average computer virus removal cost in London starts from £45, depending on the issue and device. Call us at 08085 01 5740 for a free quote and instant support anywhere in the UK.
Can you remove viruses remotely?
Yes, we offer a secure remote virus removal service across the UK. Our experts can connect safely to your computer, remove malware or spyware, and restore full protection — all without you leaving your home or office.
How long does computer virus removal take?
Most computer virus removals take between 30 minutes to 2 hours, depending on the infection level. Hire IT Expert technicians diagnose, clean, and optimise your system the same day — ensuring your laptop or PC runs smoothly again.
