Antivirus software is a program that protects your computer from viruses malware and other threats. To install antivirus software on your computer you can follow these steps: 1. Choose an antivirus software that suits your needs and budget. You can find some recommendations here. 2. Download the antivirus software from its official website or a trusted source. 3. Run the installer and follow the instructions on the screen. 4. Activate the antivirus software with a license key or a subscription plan. 5. Update the antivirus software regularly and scan your computer for any potential threats.