1. Choose the Right Antivirus Software

• Research top antivirus solutions like Norton, McAfee, Bitdefender, Avast, etc.
• Ensure the antivirus is compatible with your operating system and device.
• Purchase a license or choose a free version based on your needs.
• Download the official installer from the vendor’s website.

2. Install the Antivirus Software

A. On Windows

• Run the downloaded installer file (usually `.exe`).
• Follow the on-screen instructions to complete installation.
• Allow necessary permissions if prompted by Windows Defender.
• Restart your PC if required after the installation.

B. On macOS

• Open the `.dmg` installation file downloaded from the vendor.
• Drag the antivirus application into the Applications folder.
• Grant necessary permissions in "System Preferences" if prompted.
• Complete setup and restart the system if prompted.

3. Activate and Register Your Antivirus

A. Using License Key

• Launch the antivirus software.
• Enter your license key or activation code provided after purchase.
• Follow any additional verification or registration steps.

B. With Online Account

• Sign in or create an account with the antivirus provider.
• Link your software license to the account for easier management.
• Ensure email verification is completed for full access.

4. Run a Full System Scan

Initial Full Scan

• Open the antivirus dashboard.
• Choose “Full System Scan” to check for existing threats.
• Let the scan complete (may take time depending on files and system specs).
• Follow recommended actions for any threats found.

Scheduled Scans

• Set up daily or weekly scan schedules.
• Customize scan times to avoid interrupting work or gaming sessions.

5. Update Virus Definitions

Manual Updates

• Open your antivirus settings or dashboard.
• Click on "Check for Updates" or similar option.
• Install any available security updates or virus definitions.

Automatic Updates

• Enable automatic updates for real-time protection against new threats.
• Ensure your system is connected to the internet regularly for updates.

6. Customize Security Settings (Optional)

• Adjust firewall, web protection, and real-time scanning settings based on your needs.
• Enable email and USB drive scanning for added protection.
• Exclude trusted files or apps to avoid false positives.

Troubleshooting Tips

• Ensure you are using the latest version of the antivirus software.
• If installation fails, disable conflicting software like older antivirus tools.
• Restart your system and try reinstalling the antivirus.
• Use the official support or help center for known issues.
• Check your system for malware with an offline scan if problems persist.