Disconnect the infected device from the internet and other devices
Back up important files to an external drive if they are not infected
Boot the device into Safe Mode
Update your antivirus or anti-malware software
Run a full system scan
Quarantine or delete detected threats
Remove suspicious browser extensions and startup programs
Uninstall unknown or recently installed software
Clear temporary files and browser cache
Update the operating system and all applications
Change passwords from a clean device
Enable a firewall
Restore the system from a clean backup if needed
Reset the device if the infection cannot be removed
Seek professional help if the problem persists