# Windows License Activation Guide

## Introduction to Windows License

A Windows license is a legal authorization that allows you to use Microsoft’s Windows operating system. Whether you’re using Windows 10, Windows 11, or an earlier version, proper activation ensures you have access to all features and receive important security updates.

## Types of Windows Licenses

There are several types of Windows licenses available:

• Retail License – Purchased individually and can be transferred to another computer
• OEM License – Comes pre-installed on new computers and is tied to that specific hardware
• Volume License – For businesses and organizations needing multiple installations

## How to Activate Your Windows License

Method 1: Online Activation

This is the simplest method for most users:

1. Open Settings > Update & Security > Activation
2. Click “Change product key” if you have one, or select “Troubleshoot” if Windows came pre-installed
3. Follow the on-screen instructions to complete activation

Method 2: Phone Activation

If you don’t have internet access:

1. Open Command Prompt as administrator
2. Type slui 4 and press Enter
3. Select your country and call the displayed number
4. Enter the confirmation ID when prompted

## Troubleshooting Activation Issues

Common Problems and Solutions

If you encounter issues during activation:

• Error 0xC004C003 – Usually means the product key is already in use. Contact Microsoft support
• Error 0x8007007B – Often indicates an invalid product key format
• Activation watermark – Check your internet connection and try activating again

## Maintaining Your Windows License

To ensure your Windows license remains valid:

• Keep your activation information backed up (for retail licenses)
• Avoid making significant hardware changes that might require reactivation
• Purchase licenses only from authorized Microsoft partners

## Conclusion

Proper Windows license activation is essential for full functionality and security. By following this guide, you can ensure your operating system is properly licensed and ready for use. Remember that using unlicensed software may lead to limited functionality and potential security risks.