Things You'll Need
Instructions
Open a Web browser and navigate to the Xbox.com website. Sign in with your Windows Live ID and password. If you don't have an account, create one by clicking on the "Sign Up" link.
Click "Register a New Console" if you have not yet registered your Xbox console. If you have registered, your Xbox console and its serial number should display on the list that appears in your browser window.
Enter your console's serial number and your full name and address if you are registering for the first time. The serial number can be found on a sticker on the back of the console. After you've entered your details, click "Submit" to continue.
Choose "View Warranty Status" to find out if the Xbox you registered is still under warranty. A new window will open revealing the purchase date and the warranty expiration date.