# Windows License Activation Guide
Understanding Windows License
A Windows license is a legal agreement between you and Microsoft that grants you the right to use their operating system software. There are different types of licenses available, including retail, OEM, and volume licenses. Each type has specific terms and conditions regarding installation and activation.
Types of Windows Licenses
Retail License
This is the most flexible type of license that can be transferred to another computer. It’s typically purchased from retail stores or Microsoft’s official website.
OEM License
Original Equipment Manufacturer licenses come pre-installed on new computers and are tied to the specific hardware they were originally installed on.
Volume License
Designed for businesses and organizations, these licenses allow multiple installations across different devices under a single agreement.
How to Activate Your Windows License
Online Activation
1. Open Settings > Update & Security > Activation
2. Click “Change product key” if you have a new license
3. Enter your 25-character product key
4. Follow the on-screen instructions to complete activation
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. Follow the automated instructions to get your confirmation ID
Keyword: Windows License
Troubleshooting Activation Issues
If you encounter problems during activation, try these solutions:
- Check your internet connection
- Verify you entered the correct product key
- Run the Activation Troubleshooter (Settings > Update & Security > Activation)
- Contact Microsoft Support if issues persist
Important Considerations
Always purchase Windows licenses from authorized retailers to avoid counterfeit products. Microsoft periodically verifies licenses, and invalid licenses may result in deactivation of your Windows copy. Keep your product key in a safe place as you may need it for future reinstalls.
Remember that proper licensing ensures you receive all security updates and technical support from Microsoft, keeping your system protected and running smoothly.