How to Know If Your Computer Has a Virus or Malware

Common signs of malware

Malware symptoms can include pop-ups, fake warnings, unknown programs, browser redirects, changed search engine, slow performance, disabled security settings, suspicious startup apps, unexpected remote access tools, missing files or unusual account activity. Some malware is obvious, but some is designed to stay quiet.

Not every slow computer has malware, and not every infected computer looks slow. The right approach is to check symptoms carefully rather than rely on fear-based messages from pop-ups.

Safe checks you can try first

• Disconnect from the internet if you believe someone has remote access.
• Do not enter passwords while suspicious pop-ups are active.
• Check installed apps for names you do not recognise.
• Check browser extensions and notification permissions.
• Run a scan using trusted security software.
• Change important passwords from another clean device if compromise is suspected.

High-risk situations

• You allowed someone remote access after a pop-up or phone call.
• Banking, email or Microsoft account passwords were typed during the incident.
• Files have been encrypted or renamed unexpectedly.
• The computer displays payment demands.
• Security software will not open.
• Business email is sending messages you did not send.

What not to do

Avoid downloading several free “virus removal” tools from unknown websites. Multiple cleanup tools can conflict with each other and some fake tools are malware themselves. Avoid deleting random system files based on internet advice.

How OCT can help

OCT can check for malware, unwanted programs, browser hijackers, suspicious startup items and remote access tools. If accounts may be compromised, you can be advised on password changes, multi-factor authentication and safer next steps.