1. Make sure you are reading from the original serial number label that came with the product.
2. Enter your first and last name, and verify there are no mistakes in the serial number field.
3. Make sure you enter a zero and not a capital letter O a 1 and not a lowercase letter L, where appropriate.
4. The dashes in the serial number are required.
5. Make sure there are no spaces before or after the serial number.