Yes, it is necessary to install anti-virus software. Here are the steps:
1. Choose an anti-virus software program. Research different brands and read reviews before deciding which one to purchase.
2. Once you have chosen an anti-virus software program, download the installer.
3. Run the installation program. This may require that you accept a license agreement and other details related to the program.
4. Follow any instructions the installation process gives you.
5. When the installation is finished, restart your computer to ensure the anti-virus software is properly installed.
6. Open the anti-virus program and perform a full system scan. This will check your computer for any potential threats that may have been missed during the installation process.
7. Monitor the anti-virus program regularly to ensure it is up to date and functioning correctly.