SQL Licensing and Activation

Hi All,

I am having trouble licensing/activating my copy of SQL Server 2012 Standard Edition.

Initially I installed using the media kit. I discovered a product key during installation and decided to run the code below

SELECT
    create_date AS 'SQL Server Install Date',
    DATEADD(DD, 180, create_date) AS 'SQL Server Expiry Date'
FROM sys.server_principals
WHERE name = 'NT AUTHORITY\SYSTEM'

 The expiry date was in 6 months time 

I visited volume license center to download the license key I had paid for only to found out that there was no product key for such products. I could only download the Software

I downloaded the software from Volume License center with the hope that the product will be a licensed one. So I opted to Upgrade the edition and during installation, I also noticed I was prompted to select the option that has product key embeded or to select Evaluation or Express Edition. I chose the option that has a product key and after the installation I ran the initial query and still found out that the product expiry date was exactly the same as before.

Can someone help me out on how to activate my SQL Server 2012 Standard edition?

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o.k