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🔒 Free Security Guide
Signs Your Computer Has a Virus — 10 Warning Symptoms
Quick Answer
Common signs of a computer virus: sudden slowdowns, unexpected pop-ups, programs opening or closing on their own, unknown software installed, browser redirects, antivirus disabled, high CPU/disk usage when idle, and contacts receiving strange emails from you. If you spot 2 or more of these, contact us — virus removal starts from $99.
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Plain-English local IT, tech support and small business systems help from Your IT and Tech Mates.
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Stop using the device or account if there is data risk, liquid, scam activity, burning smell, sparks or repeated failed startup.
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Local helpMelbourne North
Use this guide first, then choose Quick Help or the most relevant local service page.
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Write down what changed, check the charger or connection only if it is safe, and take photos of any message, damage or symptom.
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Helpful next pages
Quick answer
Common virus warning signs include pop-ups, suspicious browser behaviour, random slowdowns, locked files or login activity you do not recognise. This guide explains what these symptoms usually mean and when to act fast.
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Helpful next steps
Start with the section that matches your problem, then use the linked guide, tool or service page for the next step.
10 Signs Your Computer Has a Virus
1. Sudden Slowdowns
Your computer was running fine, now everything takes forever to load — including startup. Malware often runs constantly in the background, consuming CPU and memory without you knowing.
2. Unexpected Pop-Ups
Random advertisements appear even when you're not browsing, or you get alarming warnings about your computer being infected (ironically, often fake pop-ups are malware themselves).
3. Programs Opening or Closing on Their Own
Applications launch, crash, or behave unpredictably without any input. This can indicate a Trojan or remote-access malware running on your device.
4. Unknown Software Installed
You notice programs in your app list or startup items that you didn't install — especially toolbars, "cleaners", or browser extensions you don't recognise.
5. Browser Redirects
Your browser keeps sending you to unfamiliar websites, your homepage has changed, or searches go through a different engine than usual. Classic signs of a browser hijacker.
6. Antivirus Disabled or Won't Run
Some malware specifically targets your security software to disable it. If Windows Defender or your antivirus keeps turning itself off, treat it as a red flag.
7. High CPU or Disk Usage at Idle
If Task Manager shows 80–100% disk or CPU usage when you're not doing anything, something is running in the background. Cryptominers are a common culprit.
8. Contacts Receiving Strange Emails or Messages
Friends report receiving odd emails from your address or strange messages via social accounts. This means your credentials may already be compromised.
9. Files Missing or Changed
Documents disappear, filenames change, or you find encrypted files with unfamiliar extensions. Ransomware typically does this before demanding payment.
10. Increased Network Activity
Your internet usage spikes unexpectedly, or your router lights are flashing heavily when you're not actively using the internet — possible data exfiltration in progress.
What To Do If You Suspect a Virus
First: disconnect from the internet if you suspect active data theft. Do not enter passwords or banking details on the affected machine. Run a full scan with Windows Defender or Malwarebytes (free version). If the scan finds threats but can't remove them — or if symptoms persist — contact a professional. Attempting DIY removal can sometimes make things worse, especially with rootkits or ransomware.
When to Call a Professional
Call us if: your antivirus found but couldn't remove the threat; you're seeing ransomware messages; personal data may have been accessed; the symptoms returned after you thought the issue was fixed; or you're not confident removing it yourself. Virus removal from Your IT and Tech Mates starts from $99, with a no-fix no-fee guarantee.
📖 Real example
Fake Telstra scam call in Wollert
A caller claiming to be Telstra — what the customer did and what we helped check afterwards.
Service
Scam Safety Help Melbourne
Device and account checks after suspicious calls or links.
Common questions
Signs Your Computer Has a Virus — FAQs
Key signs include: sudden slowdowns, unexpected pop-ups, unknown programs installed, browser redirects, antivirus disabled, high CPU usage at idle, contacts receiving strange emails from you, and missing or changed files.
For minor infections, running Windows Defender or Malwarebytes may be sufficient. However, rootkits, ransomware, and persistent adware often require professional tools and expertise to remove safely.
Virus removal at Your IT and Tech Mates starts from $99. More complex infections involving rootkits or ransomware recovery may cost more — we quote upfront before starting work.
Not if done correctly. We always attempt to preserve your data during virus removal. In severe cases where reinstallation is required, we back up your files first where possible.
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