Disconnect the computer from the internet
Unplug external drives and USB devices
Restart the computer in Safe Mode
Run a full scan with updated antivirus software
Run a scan with a second trusted anti-malware tool
Quarantine or delete detected threats
Remove suspicious browser extensions and add-ons
Uninstall unknown or recently installed programs
Clear temporary files and browser cache
Update the operating system and all software
Change passwords from a clean device
Restore the system from a clean backup if needed
Reset the browser settings if the browser is affected
Reinstall the operating system if the infection cannot be removed
Back up important files only after confirming they are clean