How to remove malware from your PC

Think your PC is infected? Here is how to clean it up safely.

1. Disconnect from the internet. This stops malware communicating or spreading while you clean up.
2. Boot into Safe Mode. Many threats cannot run in Safe Mode, which makes them easier to remove.
3. Run a reputable malware scanner. Use a trusted tool such as Malwarebytes or your antivirus to run a full scan.
4. Quarantine and remove what it finds. Let the scanner delete or quarantine detected threats, then reboot.
5. Run a second full scan. Confirm the system is clean with a fresh full scan from your main antivirus.
6. Change your passwords. If malware was present, update important passwords from a clean device.

Signs your PC is infected

Tell-tale symptoms include sudden slowness, pop-ups and new toolbars, your browser homepage or search engine changing on its own, programs you did not install, or your security software being switched off. Any of these is worth investigating — the sooner you act, the less damage malware can do.

Step-by-step removal

1. Disconnect from the internet to stop the malware communicating or spreading.
2. Reboot into Safe Mode so most malware does not load.
3. Run a full scan with a dedicated remover such as Malwarebytes, and quarantine or delete what it finds.
4. Run a second scan with your main antivirus to catch anything missed.
5. Clear your browser cache and reset it, removing unknown extensions.
6. Change important passwords from a clean device, then update Windows and your apps.

When to get help

If the malware keeps returning, you cannot boot normally, or you suspect ransomware (files encrypted with a ransom note), stop and seek professional help — and never pay a ransom, which rarely restores files and funds more attacks. A clean reinstall from a trusted backup is sometimes the safest fix.

FAQ

Can I remove malware for free?

Often yes — Malwarebytes’ free on-demand scanner removes most common malware and adware. Ongoing real-time protection is where a paid antivirus earns its keep.

Will antivirus remove all malware?

A good scanner removes the vast majority. Stubborn rootkits or ransomware may need Safe Mode, specialist tools, or a clean reinstall.