To enter your Norton product key and activate your Norton antivirus software, follow these general steps:

Locate your Norton Product Key: You should have received the product key when you purchased Norton. It is usually a 25-character alphanumeric code.

Install Norton Software:

If you haven't already, download and install the Norton antivirus software on your computer. You can usually download it from the Norton website.
Follow the on-screen instructions to complete the installation.
Open Norton Security:

Launch the Norton software on your computer. You can usually find it in your system tray or by searching for "Norton" in your computer's programs.
Access Activation or Subscription Section:

In the Norton software, look for an option like "Activate," "Subscription," or "Renew."
Click on that option to open the activation or subscription section.
Enter Your Product Key:

You'll be prompted to enter your product key. Type it in carefully, making sure to enter all 25 characters correctly.
Some versions of Norton may have a "I have a key or code to enter" option that you need to select before entering the key.
Activate Norton:

After entering the product key, click on the "Activate" or "Submit" button.
Norton will then verify your key and activate your subscription.
Confirmation:

Once the activation is successful, you should receive a confirmation message indicating that your Norton product is now active.
Update and Run Scans:

After activation, it's important to update your Norton software to ensure you have the latest virus definitions and security updates.
Run a full system scan to check for any existing threats.
Please note that these steps can vary slightly depending on the version of Norton antivirus software you're using. If you encounter any issues or if your Norton product key isn't working, it's advisable to contact Norton customer support for assistance. They can provide specific guidance based on your situation and product version.

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