A colleague of mine gave me the SQL Server 2008 Standard ISO image and I used that while building a Virtual Machine.
Now, when I installed SQL Server with that above mentioned ISO, I did not give it a key and I chose Enterprise Evaluation.
So, the instance has now been activated with 180-day expiration.
I do have a valid MSDN Subscriber login but when I login and search for SQL Server 2008 it comes up with the download but says No Product Key is required.
How do I now enter the product key?