Malware rarely announces itself. Instead your computer just starts acting a little off — slower, noisier, full of pop-ups — and it is easy to blame old hardware. Knowing the warning signs lets you catch an infection early, before it drains accounts or spreads. Our GetMyPassword team explains how to tell if your computer has malware and what to do about it.
Warning signs to watch for
- Sudden slowness or constant crashing with no obvious cause.
- Pop-up ads appearing on the desktop or in your browser.
- Your browser changed — a new home page, toolbar or search engine you did not set.
- Unknown programs you did not install, or an antivirus that has been switched off.
- Friends receive spam from your email or messaging accounts.
Any one of these can have an innocent cause, but several at once is a strong signal something is wrong.
What to do if you suspect malware
Start by disconnecting from the internet to stop data leaving your machine. Run a full scan with reputable antivirus software and remove anything it flags, then uninstall programs and browser extensions you do not recognize. Make sure your system and browser are fully updated, since malware often gets in through old, unpatched software.
The most important step after cleaning an infected computer is changing your passwords from a device you trust. Malware may have already copied what you typed, so new passwords are how you take back control.
Change your passwords afterward
Malware can quietly record passwords, so once the computer is clean — or from a separate device you trust if you are unsure — change the passwords for your important accounts, starting with email and banking. Give each a unique password from our password generator and turn on two-factor authentication, so even a password that leaked before the cleanup can no longer be used.
Frequently asked questions
How do I know if my computer has malware?
Common signs include sudden slowness or crashes, unexpected pop-up ads, a changed browser home page or search engine, unknown programs, a disabled antivirus, and friends receiving spam from your accounts. Several of these together strongly suggest an infection.
What should I do first if I think I have malware?
Disconnect from the internet, run a full scan with reputable antivirus software, remove anything it flags, uninstall programs and extensions you do not recognize, and make sure your system and browser are fully updated.
Should I change my passwords after removing malware?
Yes. Malware may have recorded your passwords, so change them once the computer is clean, or from a separate trusted device. Start with email and banking, use unique passwords, and turn on two-factor authentication.