Looking for a perfect antivirus for your pc or laptop. You can use 'Avast Antivirus' – a robust antivirus programme.
You can use the free version.
It's compatible with Windows 10, 8.1, 8, 7, Vista, XP SP3.
To download it, go here: Avast Antiviris
Just for caution: Before you install it to your pc, uninstall or remove any other antivirus programm you are running. Two antivirus programms on the same pc can cause a 'crash'.