McAfee Security Center Installation

Hi,

Recently I purchased a Dell Inspiron1464 laptop. The system came with 15 months  subscription to McAfee Sapphire MUI. Due to my personal requirements I formatted the system to have 2 OS (Windows 7 & XP). And McAfee Sapphire MUI preinstalled in the system removed. I downloaded the anti-virus again from the My Downloads and installed McAfee Security Center. But the new subscription is showing valid only for 45 days.  

Can you please suggest me how I have to proceed to get the 15 months subscription.

Thanks,

Kannan V